Vigilante Dead - Berkom D.V.

Death. Lies. Revenge. How far would you go to protect your family? PI Kate Jones lands a case that changes everything: a young college student with no history of drug abuse dies of an overdose, and the parents come to Kate demanding answers. Soon, Seattle is reeling from dozens more deaths, all with the same chemical markers.

At first, police assume that the victims are closet junkies who got a hold of a bad combination, but after someone close to her becomes a victim, Kate believes something far more sinister is going on. The deeper Kate digs, the more she uncovers about the deadly drug's origins, forcing her to choose between doing what's right... and getting revenge.