I have officially read this three times (partially because it is an enjoyable read and partially because I forget story details by the time a new book comes out in the series). And while I already knew the story, I still found myself enjoying Truly Devious.

Things I particularly like about Truly Devious:

There are two timelines, with the earlier one very much impacting the later one.

Stevie Bell is a delight. A quirky, intelligent, driven detective with flaws navigating being a teenager. 

The setting is an exclusive boarding school.