Molly Murphy Sullivan's husband, Daniel, a captain in the New York City police force, is stumped. He's chasing a murderer whose victims have nothing in common - nothing except for the taunting notes that are delivered to Daniel after each murder. When Daniel receives a note immediately after Molly and her young son, Liam, are in a terrible train crash, Daniel and Molly both begin to fear that maybe Molly herself was the target. Molly's detective instincts...