Transit security officer Casey Holland is surrounded by troublesome teens-her thirteen-year-old ward is dating a manipulative boy, a group of juvenile shoplifters attack her on the job, and during her first volunteer shift at a youth custody center, she is shocked to find a friend's grandson, Justin, inside.

Shock turns to horror when the facility's director suffers a fatal heart attack in front of her. A second death and rumors of illegal activity at the correctional facility make Casey wonder whether Justin is partly responsible or potentially in danger. As Casey fights to protect her ward, her friends, and the youths at the center, escalating violence threatens to change her life forever. Who will live and who will die?

The Deep End, the fourth installment of the Casey Holland mystery series, will have you compulsively turning its pages until the explosive conclusion.