The Return (the Chroniclers, 1)

A body is uncovered in an empty classroom at Lincoln Lane Prep, West Jackson Boulevard, it's ruled as an accident. A heroin overdose. The case is closed within a month. Holly Steinfeld already has enough on her plate with her parent's re-engagement, school, and settling into a town she once considered a distant memory. But who can resist a good mystery? Enthralled by the Leighton case--teenage girl found drugged and dead on the night of her prom--Holly finds herself digging into a world of lies, secrets, and manipulation to uncover what really happened to Scarlett on the night of her prom. Can she reopen a cold case and make it back in time for her parent's wedding?