On Fire by CARLA NEGGERS

Former FBI agent John Straker is living as a virtual recluse when a distraught young woman bursts into his hideaway claiming to have found a dead body. Riley St. Joe wants to forget the whole incident. But when the body is identified, she discovers not only did she know the victim, but her own grandfather is the chief murder suspect. Riley's only hope of clearing the old man's name lies in allying herself with Straker. He is rude, cynical, frustrating but they share a desire to get at the truth. And a surprising passion that sets them both on fire