Now & Then by Robert B Parker

Boston PI Spenser is hired by Dennis Doherty to find out if his wife is being unfaithful, but he doesn't really want to give Spenser any information. Spenser agrees to the job, does the investigating, catches the wife, reports back to Doherty, job done right? Wrong. Next thing Spenser knows, all hell breaks loose and 3 people are dead. And his beloved Susan Silverman is in danger. Parker's writing is like a movie unfolding in your mind. I really like this style and the characters in his plots. Great story. Sandy P