His first novel, "The Kremlin Letter", drawn from his work in the US Army's Counterintelligence Corps, was published in 1966 and made into a film by John Huston in 1970. Behn's non-fiction "Big Stick-Up at Brink's" about a 1950 raid on a Boston armoured car facility, was published in 1977 and adapted into a 1978 movie starring Peter Falk and Peter Boyle. His controversial book "Lindbergh: The Crime" (1993) delved into the Lindbergh kidnapping, claiming that the baby had died in a family accident, and the kidnapping was faked.