A Kiss Before Dying, by Ira LevinRead about another entry on the list.
This classic noir is evergreen; no matter how many decades pass, the core story remains chillingly plausible. Bud Corliss meets Dorothy, the young daughter of a wealthy tycoon, and begins a secret romance with her, seeing a comfortably wealthy future for himself. When she becomes pregnant out of wedlock, however, he knows her father will disown her. He tricks Dorothy into writing what could be taken as a suicide note, then throws her off a roof. He arranges to meet and woo her sister Ellen, which goes well—until Ellen’s conviction that her sister wasn’t a suicide forces him to murder her, too. He moves on to the third sister, Marion—who he successfully seduces and becomes engaged to. None of this is a mystery to the reader; the only mystery is whether Bud will be exposed and punished before he manages to get his hands on the family fortune. The skilled depiction of a sociopath remains a powerful reading experience, even without the mystery element.
--Marshal Zeringue