After discussing Tatsuya's disappearance with Shigeko, Conan finally realized what had happened. The Detective Boys gather with the Silver Detectives who are considering disbanding due to their lack of detective abilities when the Detective Boys asks the Silver Detectives' help with getting a confession out of Tadao.
Confronting Tadao, Conan explains that is is strange that after four years, an earnest son like Tatsuya would have absolutely no contact with his parents. Believing that Tadao murdered Tatsuya four years ago, Conan continues by explaining that Tadao could not let his wife know about the fate of their son so Tadao decided to bury his body in the yard. Tadao's horrified reaction to Yasuko notifying him about the discovered skeleton in the yard was likely due to Tadao mistaking the discovered skeleton to be that of his son.
Tadao refutes by explaining that a decomposing body would have an odor that Kazue and the neighbors would have noticed. However, the stench was masked by a house that was full of rubbish that got demolished after the decomposing smell subsided.
Without any concrete evidence, the Silver Detectives attempt to get Tadao to confess to his crimes through compassion as Tadao truly loved his son:
- Tatsuya was buried in the yard instead of further away like in the mountains
- Tadao secretly prayed for Tatsuya everyday for four years
Finally, Yasuke appeals to Tadao to give Tatsuya a proper burial that he deserves. Everyone pressures Tadao to come clean before Tadao explains that Tatsuya attempted suicide four years ago.
Attempted suicide (past)
Location: Tadao Yuge's house
Victim: Tatsuya Yuge
Age: 27 years old
Time: Four years ago
Method: Painkillers
Tatsuya attempted suicide after making a mistake at work but was stopped by his Tadao.
Involuntary manslaughter (past)
Location: Tadao Yuge's house
Victim: Tatsuya Yuge
Age: 27 years old
Time: Four years ago
Method: Trauma to the head
Culprit: Tadao Yuge
After Tadao saves Tatsuya from committing suicide, the two get into a fight where Tatsuya loses his footing, falling backwards and hitting his head on the floor and dying.
The police are called in to dig up Tatsuya's body after Tadao's confession. Before being taken away Tadao shows his appreciation to the Detective Boys and the Silver Detectives for allowing him to put Tatsuya to rest next to Kazue.
The post-credits scene is set in front of Beika station where the Detective Boys discover the Silver Detectives handing out flyers for their detective services. Ayumi, Mitsuhiko, and Genta get angry and start chasing the Silver Detectives around a water fountain because the flyers call the Detective Boys the assistants of the Silver Detectives.
