The Geography Of Murder (Geography of Murder #1)
P.A. Brown

But Alex Spider sees the darker side of humanity daily, and he isn't looking for connections, only to drown himself in encounters with nameless subs willing to let him play his bondage games. His attraction to Jason begins as lust for one more golden boy, but their games of pain and pleasure grow into a tenuous trust, arousing feelings in Spider that are the first light he's seen in a long time.
But as Spider races to solve a brutal homicide, the daily grind of the job takes its toll, and Spider's control slips dangerously. A killer closes in, and Spider must confront his own inner darkness, while Jason struggles to save himself by making some hard choices.