Another great thriller in the 'New York Times' bestselling Robert B. Parker series.

Spenser and his new apprentice trace the disappearance of a young woman to an international crime ring that has been operating with impunity because of the powerful and highly connected billionaire at its helm.

Almost ten years ago, Spenser helped teenage Mattie Sullivan find her mother's killer and take down an infamous Southie crime boss. Mattie, now a 22-year-old college student with a side job working for the iconic private eye, dreams of being an investigator herself. When the teenage sister of a friend loses her backpack and laptop in a sordid episode, Mattie decides to take the case. She soon realizes that Spenser's advice would be useful. Taking a cue from her boss, Mattie has a knack for asking the right questions to the wrong people.

It's not long before Spenser and Mattie find ties between Chloe and other young girls to an eccentric billionaire Peter Steiner and his sleazy friend Poppy. The man has connections to local politicians, the state house, and beyond. As a bleak winter bears down on Boston, Spenser and trusted ally Hawk must watch out for Mattie, and themselves, as she unravels a sex trafficking ring that will take them from Boston to Miami and The Bahamas and, in the process, cross paths with local toughs and an old enemy of Spenser's - The Gray Man - for a final tense showdown.

Librarian's note: this is one of the Ace Atkin's Spenser series. As of 2021, there are 9 volumes by Atkins. The first was "Lullaby" in 2012, the 40th in the overall series created by Robert B. Parker; the most recent, "Someone to Watch Over Me," is the 48th.