Bad Business (Spenser Mystery)

When Spenser is hired by Marlene Cowley to conduct a surveillance job on a possible unfaithful husband, he discovers not only an adulterous spouse but also a second investigator, hired by the husband to look after his wife, in a case that embroils him with an unconventional--and unlawful--sex therapist, corporate corruption, and murder. 225,000 first printing.