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...

Henry Cimoli and Spenser have been friends for years, yet the old boxing trainer has never asked the private eye for a favor. Until now. A heavy-handed developer is trying to buy up Henry's condo on Revere Beach and sends thugs to move the process along. Soon Spenser and his apprentice, Zebulon Sixkill, find a trail leading to a mysterious and beautiful woman, a megalomaniacal Las Vegas kingpin, and plans to turn to a chunk of land north of Boston...

Kinjo Heywood is a hard-nosed linebacker for the New England Patriots who's earned his reputation as one of the toughest guys in the league. When off-field violence repeatedly lands Heywood in the news, his agent hires Spenser to find the men who he says have been harassing his client. Heywood's troubles seem to be tied to a nightclub shooting from two years earlier. When Heywood's nine-year old son, Akira, is kidnapped, ransom demands are given,...

"Carolina Garcia-Ramirez is taking on the establishment with her progressive agenda. When her chief of staff reaches out to Spenser for security and help finding the culprits of what he believes to be the most credible threats, Garcia-Ramirez is less than thrilled. She's used to the antipathy and intimidation women of color often face when seeking power. To her, it's all noise. But it doesn't take long for Spenser to cross paths with an extremist...