Erica Jensen, the heroine of this sterling series launch from Mack (the Sam McRae series), survived her deployment to Afghanistan in 2011 as a member of a team of female Marines “who performed valuable back-up to the ground troops and intel-gathering duties.” But the concussion she received from an explosion left her addicted to painkillers, a condition that barred her from later getting a PI license in Maryland. Instead, Jensen takes on research assignments from clients with their own reasons for not going to someone with official credentials. Her latest such job comes from Stuart Blaine, an affluent real-estate developer with a drug-dealing conviction, whose college student daughter, Melissa, has been out of touch for four days. Blaine fears something bad has happened, and Jensen agrees to spend a little time tracking down Melissa. Her discovery of a murder victim connected with her employer raises the stakes. Mack never makes her lead’s work feel anything but realistic and captures the psyche of an addict’s struggles. Fans of flawed but empowered female detectives will be pleased with this exceptional mix of character study and detective work. (Self-published)