P'Town Murders — Jeffrey Round

When circuit party boy Ross Pretty overdoses on Ecstasy, his death is ruled accidental. That is, until former lover and top-level secret agent Bradford Fairfax comes to Provincetown. In The P'Town Murders, Brad at first thinks he's pinned Ross's murder on Hayden Rosengarten, a wealthy, evil-minded entrepreneur. But then Hayden turns up dead. And he won't be the last to die. Now not only must Brad solve a series of puzzling murders in "the gayest place on earth," but he also must find a way to stop an insidious plan to assassinate the Dalai Lama.