''The Manchurian Candidate is a novel by Richard Condon, first published in 1959. It is a political thriller about the son of a prominent U.S. political family who is brainwashed into being an unwitting assassin for a Communist conspiracy.
The novel has been adapted twice into a feature film with the same title, in 1962 and again in 2004. The 1962 film is faithful to the book; the 2004 remake updates the action and alters characters.''
Plenty of material coming up for a third film which could be a documentary this time around
