Book Log 2020 #61: The Secret Place by Tana French
A boy is killed on the grounds of a girls boarding school, and the case goes unsolved. A year after the death, Stephen Moran reopens the investigation after one of the students presents a flier from an anonymous bulletin board called "The Secret Place" where the person who posted it claims to know who killed the boy.
Moran, teamed up with the standoffish Antoinette Conway, find that there are competing cliques that may be involved (of course, it's a high school), and as they make progress they run into a complication in the form of Frank Mackey, a fellow member of the Dublin Murder Squad, whose daughter is in one of those cliques.
One of the things I liked about this book is that while the title refers to a bulletin board, there's no shortage of secret places that get examined. There are other physical spaces that are secret. The cliques have their own secrets, and each student has secrets that they don't share within the clique. The police all seem to have their own secrets as well. This shouldn't be surprising from a series where the psychological is as much a part of the plot as the police work.
It's also not surprising that this book is of the same quality as the previous entries in the series.