Private Eye in the Distant Sea
 The suspicious boat
At Maizuru Bay, on the dawn of April 20, a coast guard named Masaaki Kurata finds a suspicious boat during his patrol. Upon examining the inside of the boat, he discovers some explosives and immediately reports this to the Wakasa Coast Guard. The discovery quickly hits the news reports, where is it revealed that the boat contains data and components not found in Japan. It's also believed to have entered Japan illegally.
 The military exercises
On the same morning, Conan Edogawa, Ran and Kogoro Mouri, Sonoko Suzuki and the Detective Boys board an Aegis Destroyer warship, Hotaka, to experience public military exercises after they've won the tickets. Before getting aboard, Conan receives a call from Professor Agasa, who's currently in Osaka together with Ai Haibara, via the newly added satellite-phone on his Stun-Gun Wristwatch. The professor wants to test if the new gadget is working properly, but doesn't forget to leave a quiz for the children before hanging up.
After boarding the ship, the participants are gathered at a meeting room. While the Chief Navigator Fumitada Inoue is explaining about the exercise schedule, Ran mentions that her watch was broken and sent to be repaired. Mitsuhiko then lends her his waterproof radio-controlled watch, which sets itself at 5 AM and 5 PM every day according to radio transmitters. Suddenly, they hear a strange loud sound. Fumitada explains that it was just the sound of the pumping system operating, however, Conan wonders whether that was really the case.
The participants are guided into the ship's Combat Information Center (CIC), where they are to witness a simulated anti-air combat. However, after having "shot down" the two set-up targets, the guards continue to detect a sonar response. An unidentified target of unknown nationality slowly approaches the ship. The tactical action officer quickly reports this to their captain, Yukio Tateishi, who orders them to search for the target, before heading to the CIC himself. Following him is a female Self-Defense Force (SDF) member, Nanami Fujii. The civilian participants are generally impressed by the realistic and tense atmosphere of the training, only Conan realizes that they're truly under attack. Yukio instructs the crews to prepare for an anti-submarine combat. They decide to fire a torpedo towards the unknown object. The ship is slightly hit with the shockwave caused by the impact. Conan then notices a sick boy with no accompanying adult. The crews are relieved that their target is nothing but a shipwreck. Fumitada announces to the participants that the "exercises" are now over.
 Meeting Yuuki and Nanami
The participants arrive at the deck during free time. Conan sees the boy from before, who is called "Yuuki-kun" by a man nearby. Conan wonders if the man is Yuuki's father, and finds it suspicious that he didn't notice the shock, and wouldn't show himself until after the free time had started. He decides to follow the two, only to be stopped by Kogoro. Conan then notices Nanami Fujii, who's also on the deck at the time. Conan borrows Mitsuhiko's camera and begs Nanami to take a group photo with them, attempting to get a close-up shot of her. When asked about her specific work on the ship, Nanami answers that she only cooks everyone's meal, a lie that Conan can easily perceive due to her captain-ranked insignia. Before Nanami leaves, Kogoro reaches for one of his flashy business card as he wants to hand it to her himself. Unfortunately, the detective's clumsiness causes the cards to fly all around them. They pick the cards up and give them to Ran.
Conan borrows Mitsuhiko's camera again and runs off to a corner. He gives Agasa a call via the satellite-phone and asks him to investigate Nanami basing on the picture that he sent to Haibara, specifically from which department does the SDF member come from. The ship crews detect a satellite transmission from where Conan was calling Agasa. They suspect that "X" is among the civilians. Conan then sees some crew members checking his previous hiding spot. He wonders whether they have found out about the call, or it was actually something else.
 Discovering the arm and its owner
Conan plans to chase after the crew members with the excuse of "going to the toilet", but Ran doesn't trust him and suggests that the two go together. On the way, Ran mentions that she almost got lost earlier, which reminds Conan that Ran isn't always good with directions. He remembers the time when Ran also got lost at Tropical Land. However, she wasn't afraid of getting lost again, because she knew that Shinichi would always find her, as he's a great detective; to which Shinichi replied: "Don't you worry! I'll always find you, wherever you are."
Unsurprising to Conan, Ran gets lost again as their path was blocked with a forbidden sign. Suddenly, they hear a scream coming from a room beyond the limit. Upon arriving, they see a human arm wearing SDF's Lieutenant uniform on the table. They advise the crew members to consult Kogoro.
In Osaka, Heiji Hattori gets a call from Conan, who informs him of the situation. He, together with Kazuha Toyama, heads off to Maizuru. The ship crews detect Conan's satellite signal again but don't find any transmitter. It is then that he learns of the person with the code name "X". Unfortunately, Conan's phone rings again as he receives a call from Agasa, who's about to inform him that their search for Nanami didn't find any match. However, he manages to hide before the crew members discover him. Conan then looks for a different method of communication, and he comes across a room with strong magnetic field.
Meanwhile, inside the bridge, Hotaka's Captain Yukio Tateishi and Captain Makoto Sekiguchi from the Wakasa Military Police discuss the case with Kogoro and Ran. Kogoro deduces that the arm wasn't cut off by a sharp blade and was removed post-mortem. As it was found inside the pumping system's filter, they conclude that the arm was sucked in by the pumping system and got stuck in the filter, making the loud sound from earlier. Yukio hesitantly reveals that the arm probably belongs to Lt. Sasaura from the Wakasa base, whose whereabouts is currently unknown. Kogoro agrees with this assumption after seeing that his clock stopped at 5:30 AM that morning. According to Yukio, Sasaura wasn't in that day's shift. As the pumping system was started when they left Maizuru Harbor, Sasaura's body must have already drifted at the time. Fearing that it would be too late for an autopsy when they get back, Conan hints that they use the helicopter to transport the arm, pretending that it's only a demonstration. Kogoro then informs Inspector Megure of the case, not knowing that Nanami is watching nearby.
Conan and Ran encounter Yuuki when they come to watch the "demonstration", and notice that his father is missing again. Yuuki doesn't want to let Ran tell the crews about his situation and attempts to run away before dropping some medicines for food allergies. Just as he's about to leave, Yuuki's father appears. Conan comes to the magnetic room and contacts Agasa, in order to avoid being discovered. Haibara tells him about her discovery. Meanwhile, at a shipyard in Wakasa Bay, Heiji and Kazuha find Sasaura's body. Heiji notices a red stain on Sasaura's neck and secretly retrieves it.
 Initial investigation
Inspector Megure, Miwako Sato, Wataru Takagi and two officers from Wakasa Coast Guard, Masaaki Kurata and Tsutomu Munekawa, arrive at the ship in a helicopter. Heiji informs Conan that he's found the body at Wakasa Bay. He surmises that Sasaura drifted there after having his arm swallowed at Maizuru Harbor. After hearing about the red stain, Conan asks Heiji to meet up with Agasa.
While the civilians are having lunch, the police suggest an investigation on the ship, considering that the victim might have been sucked into the pump before she ship departed. Conan follows them to the deck, where they find Sasaura's phone. The last email was after 9 PM and the last call was at 5:30 AM. According to the autopsy, his death was between 4 AM and 6 AM and the cause of death is drowning, which means that he was on the ship before falling into the sea at 5:30 AM. Kogoro deduces that Sasaura had a fight with someone on the deck and was eventually pushed down. This also confirms that his body was stuck in the filter before the departure, and the arm was severed when they left Maizuru Harbor. Sato finds an empty microSD slot on the phone. Kogoro thinks that the card was the culprit's target. Conan then sees Nanami spying on the investigation and gives chase.
 Nanami's mission and spy "X"
Nanami enters the captain's office and checks the content of the microSD card stolen from Sasaura's phone. Conan imitates the captain's voice to trick her out of the room. Conan finds out that she hasn't completely deleted the extracted data and attempts to copy them into the new USB flash drive on his watch. However, Nanami realizes that she was tricked and quickly makes her way back to the office, Conan is thus unable to retrieve all of the data. She wonders why X is interested in the data. To uncover her true identity, Conan deliberately sends the data to Agasa from within the room, creating a detectable satellite signal.
The police arrive at the captain's office. They demands that Nanami explain herself, but Yukio and Makoto refuse to cooperate. Conan then comes out and innocently points out all of the contradictory facts about Nanami, forcing her to reveal herself as a member of the Intelligence Security Command. Due to the incident with the foreign boat, they suspect that the spy X, whose target is believed to be classified intel on Aegis Destroyers, might be on board. It's also revealed that the victim was the Director of Intelligence for the Wakasa SDF base. His duty was to guard information on Aegis Destroyers. Because of this, they suspect that X was the killer. Conan wonders why Nanami doesn't talk about the card. He plants a bug on Kogoro before running off.
 Investigation on the victim
Conan asks Heiji, who's now inside Agasa's car, about the red stain. They learn that it's anti-fouling paint, a special paint used for ships. Conan asks them to check if the paint was from Hotaka. Heiji says that there is no current that could've sent the victim's body from Maizuru Harbor to Wakasa Bay. Conan then asks about the data from earlier, about which Agasa reveals that it's indeed a data of Aegis Destroyers, and was copied from a cloud service. If they have the ID and password, they can get the original data from the cloud. Conan wonders why would Sasaura store such important data on a public cloud service. He instructs Agasa to access the cloud data and send it to the captain's office.
Back in the captain's office, Kogoro asks Inspector Fumimaro Ayanokoji, who's just arrived, to share the result of his investigation. Having investigated the victim's actions before his death, Fumimaro reveals that at 5:30 AM, Sasaura was waving a Japanese flag on a cliff at Maizuru Harbor, as witnessed by a crew member of a sightseeing cruise nearby. He then asks Makoto about the interrogation of Sasaura, but Nanami doesn't let the latter answer. Luckily, Agasa sends the data as instructed, forcing Makoto to reveal that data about the ships have been leaked by Sasaura, and sent to a shell company of a spy called Takekawa. This, together with the suspicious boat, indicates that a spy from the same country as Takekawa attempted to board this ship with the victim's help. It also explains Nanami's motive for taking the memory card. Nanami contacts her superior, and learns that Takekawa has been spotted in Kyoto. His plan is to meet up with X, who's currently on board. They then work together to track down Takekawa.
 Takekawa's whereabouts and the truth behind the shipwreck
Components from the same country as the ones in the foreign boat was found on the shipwreck. As the sailing route of the ship was changed from right to left that morning and only people from the Wakasa base knew about this, X wouldn't have known the true direction to send out the shipwreck. However, the flag that Sasaura waved turns out to be a signal flag, the purpose of which was to inform X of the change. Nanami becomes suspicious of Conan's knowledge.
Takekawa was spotted at 12:03 PM in Ponto Town Park (Kyoto), where he's shown dropping something into a trash can. Conan asks Heiji to go to the park before the police do. At 12:10 PM, Takekawa got on an express train to Osaka. They then ask the Osaka Police to cooperate.
Heiji manages to catch up before the police arrive and takes a photo of Takekawa's burned memo.
Back at the cafeteria, Conan revises the whole case and realizes X's motive for sending the shipwreck. Unexpectedly, Nanami approaches him and questions about his identity. Without telling her the truth, Conan drops his façade and directly asks Nanami whether there is any kind of data that can only be obtained on the ship. Nanami confirms his theory and says that the only two places where such data can be found are the CIC and captain's office. Conan deduces that during the emergency, the captain had to come to the CIC; that's when X made his move in the captain's office. He now realizes who X is and quickly runs off, with Nanami and Ran chasing behind. Makoto then informs Nanami that they spotted Takekawa at Yodoyabashi Station (Osaka). Conan tells Heiji to go after him, while he confronts X himself.
 X's true identity
 In other languages
|German||Detektiv auf hoher See||Detective on the High Sea|
|Vietnamese||Con mắt bí ẩn ngoài biển xa||Mysterious Eye in the Distant Sea|
|Chinese||绝海的侦探||Detective in the Distant Sea|
- 'Private Eye in the Distant Sea' grossed 3,509,406,150 yen.
- It was from The Fourteenth Target that Conan didn't use Kogoro in a case resolution.
 See also
|Detective Conan Movies|
|Movies||Movie 01: The Time-Bombed Skyscraper • Movie 02: The Fourteenth Target • Movie 03: The Last Wizard of the Century • Movie 04: Captured in Her Eyes • Movie 05: Countdown to Heaven • Movie 06: The Phantom of Baker Street • Movie 07: Crossroad in the Ancient Capital • Movie 08: Magician of the Silver Sky • Movie 09: Strategy Above the Depths • Movie 10: The Private Eyes' Requiem • Movie 11: Jolly Roger in the Deep Azure • Movie 12: Full Score of Fear • Movie 13: The Raven Chaser • Movie 14: The Lost Ship in the Sky • Movie 15: Quarter of Silence • Movie 16: The Eleventh Striker • Movie 17: Private Eye in the Distant Sea • Lupin III vs. Detective Conan: The Movie (crossover) • Movie 18: Dimensional Sniper • Movie 19: Sunflowers of Inferno • Movie 20: The Darkest Nightmare • Movie 21: The Crimson Love Letter • Movie 22: Zero the Enforcer • Movie 23|
|Related Cases||16 Suspects!? • Conan, Heiji, and the Vanished Boy • Time Travel of the Silver Sky • Follow the Vanished Diamond! Conan & Heiji vs. Kid! • A Challenge from Agasa! Agasa vs. Conan and the Detective Boys • Magic File 2: Shinichi Kudo, The Case of the Mysterious Wall and the Black Lab • Lupin III vs. Detective Conan (crossover) • Magic File 3: Shinichi and Ran, Memories of Mahjong Tiles and Tanabata • Magic File 4: The Osaka Okonomiyaki Odyssey • Magic File 5: Niigata~Tokyo Souvenir Capriccio • Magic File 6: Flower of Fantasista • The Missing Sweets in the Old Shop • The Coded Invitation • Promise with a J-Leaguer • Munch's Missing Scream • The Shadow Approaching Amuro • The Mystery of the Vanished Black Belt • The Melting Cake!|