The Good Guy by Dean Koontz
Unabridged Audio - 9 CDs
Dean Koontz is rapidly straying from his "horror" type books and writing some very, very good mysteries.
Tim is just an average guy. He does masonary work and stops at the local bar for a beer before going home. A nervous little guy sits next to him and when he leaves he thrusts an envelope at Tim. Inside are a picture of a woman the little man wants eliminated and a big wad of money. When the actual assassin comes in and sits beside Tim, he gives him the envelope, minus the woman's picture, and tells him he has changed his mind to keep the money and not do the job. But the assassin isn't just any assassin and Tim and the woman in the picture are soon running for their lives.