Gilbert Maurice Norman (7 April 1915 – 6 September 1944) was a British Army officer who served in the Special Operations Executive in France during World War II.
Norman was born in Saint-Cloud, Hauts-de-Seine, to an English father and a French mother and was educated in France and England.
He joined the army, receiving a commission in the Durham Light Infantry in November 1940 and was subsequently recruited into the Special Operations Executive (SOE).
The Germans used Norman's captured wireless set to transmit their own false messages to SOE Headquarters in Baker Street.
Norman attempted to warn London that he was in captivity by not giving the Germans the second part of his security check, which they did not know about.
Omitting the security check from a message was specifically designed to act as a duress code which would warn London that the sender was being coerced.
However, Norman was frustrated when London sent a curt reply telling him to correct the omission.
The Germans were thus able to set a trap which resulted in the capture of Jack Agazarian who had been sent with Nicholas Bodington to investigate the fate of the Prosper network.