When a presidential candidate dies unexpectedly in the middle of the campaign, the Democratic party unexpectedly picks a Washington, D.C. alderman as his replacement.

Veteran Secret Service agent Frank Horrigan is a man haunted by his failure to save President Kennedy while serving protection detail in Dallas. Thirty years later, a man calling himself "Booth" threatens the life of the current President, forcing Horrigan to come back to protection detail to confront the ghosts from his past.