Body to Dye For

From Goodreads:

Book 1 in the Stan Kraychik Mystery series

Hot water is nothing new for Stan Kraychik, a smart-mouthed Boston hairdresser who gave up a career in psychology to "shrink 'em at the sink" instead. When a vacationing National Park ranger turns up dead in Boston, Stan is implicated in the murder, and must find the killer to clear his own name. With an eye for detail and a mettlesome spirit, Stan finds plenty of clues, but he also confronts the police lieutenant assigned to the case, a man with little tolerance for the world of fashion and style, or for Stan's cheeky attitude.

With a sharp tongue as his best defense, a most unlikely detective uses even more unlikely techniques to close the loop and get the killer.