I'm a librarian who loves anime, manga, and reading a wide variety of genres.
I just stopped to look at the book description again, because what's currently happening doesn't quite match what I recalled from the description. Whoever wrote that must have been working off an earlier draft of the book or something, because it's way off base on one key aspect. It says that Charlie's girlfriend, Helen Louise, ends up suspected of murder because several party guests overheard her having a loud argument with the victim. In reality, it was the local pharmacist's insanely jealous wife who had the loud argument, and she hasn't yet been brought up as a major suspect because her husband dragged her home well before the murder happened.