Filled with tawdry sexual shenanigans, bestseller Parker's fifth Jesse Stone novel (after 2003's Stone Cold) finds the former L.A. cop, now the police chief of Paradise, Mass., tentatively reunited with his ex-wife, Jenn, and approaching a year since his last drink. The murder of a woman aboard a sailboat leads Stone into a world of wealth and depravity centered on a couple of yacht owners from Florida and their crowd. Drugs, pornography, rape and underage sex provide a degrading framework for the murder investigation. Stone gets a valuable assist from Kelly Cruz, a Fort Lauderdale cop, as he traces the backgrounds of victims and suspects. The laconic Stone with his uncertain relationship with Jenn, his struggle with alcohol and his visits to a therapist presents a striking contrast to Parker's primary hero, Spenser. But much of the dialogue is interchangeable: witty, flirtatious, droll and sexually charged. The outcome manages to be both surprising and depressing. Stone is a work in progress whose following is likely to increase as he continues to grow.