The lads from hut 29 find a letter about a course in the South of France, Bullimore can't help being suspicious about a change in behaviour, and Popplewell tries to learn French in the hope of meeting Marilyn Monroe.
A new officer takes charge of the depot while Upshot-Bagley's away on leave, news of a fire precaution check is seen as an ideal way to prove himself, and smoke canisters are brought in to get the lads on their toes.
Due to an incident causing the loss of a hut a sergeant and three privates have to share with the occupants of hut 39 the four newcomers are in for a shock...