The Professional - Robert B. Parker

A local lawyer claims her friends are being blackmailed. Spenser agrees to take the seemingly straightforward case, but when women start turning up dead, Spenser's assignment takes a sinister turn. Available in a tall Premium Edition. The wives of Boston's wealthiest men have a mutual secret: they all had an affair with the same cad who's blackmailing them, and Spenser's been hired to stop him. But when the wives start dying one by one, Spenser's new case becomes murder.