Stevie, the teen detective from the Truly Devious series, is on her first commissioned cold case. Gazillionaire tech bro Carson someone brings her to a small town to solve a 40+ year-old quadruple murder. Carson is so invested in Stevie, he invites her friends along, too, putting Janelle in charge of the town's summer camp art program and Nate in charge of hiding in a tree. Stevie's boyfriend David declines to join for doing good reasons, but still manages to be part of the drama. 

It's an engaging read that doesn't go super deep, but isn't shallow either. The way Stevie wraps things up doesn't make sense from the clues the reader has been given, but whatever. I do have one problem with the book: murder victim Sabrina Abbott was supposed to be attending Columbia University in the fall of 1978, something she would not have been allowed to do until the university accepted women undergrads in 1983.