During World War II the British army is attempting to retrieve an Enigma machine from Germany. Having failed in previous attempts they decide to send four men undercover to the factory that makes the devices, deep in Berlin. Unfortunately the factory is populated entirely by women, and they only have men to send.
American O'Rourke teams with British transvestite Tony Parker, genius Johnno and the reluctant Archie. The four are sent to infiltrate the factory dressed as women.
Dropped in the wrong area, the team must first try to find their bearings. Aided by Romy, a sympathiser of their cause, they find their way to the factory. They manage to retrieve the Enigma machine, against the expectations of the British army. Arriving home they find that they were tricked – the British government already had the device but wanted to make the Germans think they were still after it.