In a Virginia penitentiary, Detective Alex Cross and his partner, John Sampson, witness the execution of a killer they helped to convict. Hour later, they are called tot he scene of a copycat crime. A note signed "M" rests on the corpse: "You messed up big-time Dr. Cross." Was an innocent man just put to death? Cross soon realizes he may have much to answer for, as M lures him out of DC to the sites of multiple homicides, all marked with distressingly familiar details. Details that conjure up decade-old cases. Details that conjure up Cross family secrets. Details that make clear that M is after a prize so dear that if the killer attains it, Cross's heart will no longer have reason to beat.