Therapy: an Alex Delaware novel

Alex Delaware has the psychologist probing a double murder. A siren lures Delaware and his friend, homicide cop Milo Sturgis, from dinner to a crime scene. An unzipped man and a half-naked woman have been found dead in a convertible parked in the driveway of an empty house. The woman's identity remains a mystery, so the murdered man, Gavin Quick, provides most of the leads, including the man's famous--and close-mouthed--therapist, psychologist Dr. Mary Lou Koppel.