Diana 'Steve' Escott-Stevens knows what she is getting herself into when she applies to become an agent for the Special Operations Executive. For 12 months she has fed and looked after agents preparing for an undercovermission in France. She knows that only half of them will come back. But she is young, brave and moreover speaks fluent French, and she is readily accepted into the SOE. The training is demanding; Sabotage, codes, hand-to-hand combat, parachute jumps. Soon she finds herself in a Lysander flying to France, where any mistake could mean capture, torture or death, for her and the innocent people of France she is trying to help resist the German army.