Bad Business (Spenser #31) (Mass Market)
One of the great series in the history of the American detective story gets even better when Spenser is hired by a jilted bride to follow a cheating husband, only to cross paths with a detective hired to tail the two-timing wife. They aren't the most trusting couple in town, but as it turns out, they are the most dangerous.
Robert B. Parker was the author of seventy books, including the legendary Spenser detective series, the novels featuring police chief Jesse Stone, and the acclaimed Virgil Cole–Everett Hitch westerns, as well as the Sunny Randall novels. Winner of the Mystery Writers of America Grand Master Award and long considered the undisputed dean of American crime fiction, he died in January 2010.