You didn't like M-2?!
That was pretty much the only classic murder case you'd read in a book.
None of the other movies had that great a mystery.
Most of them were just isolated or un-dramatized murders which really became a bore.
M-2 also had the classic "everyone is trapped in a certain area" thing going on, except with an epic twist.
I personally didn't "love" it, but it was okay, to say the least.