Déricourt's service with SOE was controversial. He is accused of betraying the Prosper network to the Germans. After the war he was accused but acquitted of being a double agent who worked for the "Sicherheitsdienst" (SD), the intelligence arm of the German SS. The theory has also been advanced by some authors that Déricourt was a triple agent working under British instructions and that the betrayal of many SOE agents was an attempt by the British intelligence agency, MI6, to mislead the Germans about the date of the invasion of France by allied forces. M.R.D. Foot, the official historian of the SOE, believed that Dericourt was a German agent but debunked the assertion that Dericourt was a triple agent.