A Stab in the Dark - Lawrence Block

Louis Pinell, the recently apprehended 'Icepick Prowler,' freely admits to having slain seven young women nine years ago -- but be swears it was a copycat who killed Barbara Ettinger Matthew Scudder believes him. But the trail to Ettinger's true murderer is twisted, dark and dangerous...and even colder than the almost decade-old corpse the p.i. is determined to avenge.