"A Spenser novel"--Cover.

Ten years ago, Spenser helped a teenage girl named Mattie Sullivan find her mother's killer. Now Mattie is a college student with a side job working for the tough but tender private eye. In her first big case, Mattie links the exploitation of dozens of girls to an eccentric billionaire and his sadistic henchwoman. Spenser and trusted ally Hawk must again watch out for Mattie as she unravels a massive sex-trafficking ring that will take them from Boston to Boca Raton to the Bahamas, crossing paths with an old enemy of Spenser's--the Gray Man--for a final epic showdown.