Marty Donovan is a cop who happens to be in love with Lenore, his partner's wife. When the two cops can't crack a tough case, Lenore suggests a stakeout that's not approved the the department. Her husband is killed, and Marty begins a complicated cover-up as the tries to find the killer.There's plenty of action and atmosphere, some nice old-time procedural details, and enough red herrings to keep you guessing about the outcome. While Backfire isn't up there with Marlowe's best work for Gold Medal (it reminded me a bit of his early Avon books), it's still an entertaining crime novel.