Promised Land — Robert B. Parker

Spenser was good at finding things. But this time he had a client out on Cape Cod who was in way over his head. Harvey Shepard had lost his pretty wife -- and a very pretty quarter million bucks in real estate. Now a loan shark was putting on the bite, sending in the toughest muscleman Boston's big boys could hire.

Spenser found himself doing a slow burn in the Cape's sand and sun. The missing wife had turned up, but she was a hot suspect in a case of murder one...the in-hock hubby had just twenty-four hours before the mob promised to make him stone-cold dead ...and suddenly Spenser was in so deep that the only way out was a plan so risky, it made dying look like a sure thing.