In the Wrong Sights (Bad Karma Special Ops Book 4)

Trauma nurse Cassidy O'Shay overheard an assassin's deathbed confession—except he didn't die. Now she's trapped in WITSEC. After her ex-stepfather, Hal, is murdered, the marshals assign her protection detail to Hal's former Army Special Ops team. SGT AJ Rozanski is supposed to convince her to testify, not fall for his late mentor's daughter.