Michelle Wilson likes her life. An organizer, everything goes according to her plans. Until . . . The first menacing letter is a shock. The first weird phone call gives her the creeps. But when Michelle comes home to an unlatched door, she calls in the police. Detective Tom Lucisi's job description doesn't include threatening letters but one look at Michelle and he opens an investigation. Living on the edge describes Clint Sharkey. He sends the first letter without a care. The phone call is a lark. But he has no idea where his "project" will lead. Three people enmeshed in the puzzle. But is there an unknown joker in the deck?

Sheriff Tom Donovan takes after his father, who was also sheriff of Sundown years ago and who possessed a strong sense of right and wrong. John Donovan, gunned down in Tom's youth by a man the boy looked up to as a hero, left a legacy of justice. But his murder left behind the need for revenge. Tom's moral fortitude is put to the test when his father's killer reappears years later. Tom, together with his father's old partner and now Tom's deputy, Ben, must not only track and face down the most cold-blooded outlaw in his neck of the wild West, but he must also fight the urge to become a murderer himself.