On what is supposed to be a quiet long weekend in New Hampshire, Deputy U.S. Marshal Mackenzie Stewart is viciously attacked at the lakefront cottage of her friend, federal judge Bernadette Peacham. Mac fends off her attacker, but he manages to escape. Everything suggests he's a deranged drifter—until FBI special agent Andrew Rook arrives.

With Rook, Mac broke her own rule not to get involved with anyone in law enforcement, but she knows he isn't up from Washington, D.C., to set things straight between them. He's on a case.

As the hunt for the mysterious attacker continues, the case takes an unexpected turn when Mac and Rook return to Washington and find Bernadette's ex-husband, a powerful attorney, shot to death. Then Bernadette disappears, and Mac and Rook realize the stakes are higher than either had imagined, and a master criminal with nothing left to lose is prepared to gamble everything.