The Sentinel is a action thriller film about a veteran Secret Service bodyguard who is suspected as a traitor after an attempted assassination of the president reveals that someone within the Service is providing information to the assassins. The film stars Michael Douglas as the veteran agent, Kiefer Sutherland as his protégé, Eva Longoria Parker as a rookie Secret Service agent, and Kim Basinger in the role of the First Lady. It is based on the novel of the same name by former Secret Service Agent Gerald Petievich. It was filmed in Washington D.C. and in the Canadian city of Toronto, Ontario.