This is the first in a series of mysteries featuring Zack Finn, ex Navy SEAL now a Boston Homicide Detective. Zack begins a forced medical leave, the result of burnout from years of dealing with lowlifes and savage violence. He chooses to recuperate at his Nantucket Island retreat. Unfortunately, a brutal murder occurs on the island. The police investigation results in the arrest and indictment of Roy DaSilva, Zack's best friend and fellow Navy SEAL. Following the SEAL credo of "No Seal is ever left behind," Zack plunges forward and seeks the aid of the multi-talented members of the Pier Group, an historic Nantucket social club. Aided by this gaggle of eccentric characters, Zack is able to probe areas conventional law enforcement officers would have difficulty in penetrating.