Just read all three Famicom Detective Clubs. The first one is pretty weak but the second and third are quite good mystery VNs, and it's wild they made a direct sequel all this time later. The Girl Who Stands Behind is a really good mystery and The Smiling Man isn't as strong a mystery (there's only one plausible candidate), but the actual story is quite good and the 25 minute fully animated epilogue OVA is incredible. Now I understand why Ayumi Tachibana was the top visual novel girl of the 80s. Read them if you have any interest in mysteries and don't mind a little 80s jank.
The scene where Ayumi's being held hostage and the hostage-taker demands you quit investigating the mystery or else he'll kill her and the only way to progress is to literally quit the game (so you 'quit' solving the mystery) is 10/10. That's some wild shit for 1989.