When Spenser is hired by a Marlene Rowley to follow her cheating husband, he soon crosses paths with a detective whos shadowing the wayward Marlene. Not the most trusting couple in town--but, as Spenser is about to learn, certainly the most dangerous. nOne 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 arent the most trusting couple in town, but as it turns out, they are the most dangerous.