Robert B. Parker's The bitterest pill - Reed Farrel Coleman

When a popular high school cheerleader dies of a suspected heroin overdose, it becomes clear that the opioid epidemic has spread even to the idyllic town of Paradise. It will be up to police chief Jesse Stone to unravel the supply chain and unmask the criminals behind it, and the investigation has a clear epicentre: Paradise High School. Home of the town's best and brightest future leaders and its most vulnerable down-and-out teens, it's a rich and bottomless market for dealers out of Boston looking to expand into the suburbs. But when it comes to drugs, the very people Jesse is trying to protect are often those with the most to lose.