The replacement pilot arrives in the form of Lieutenant Michael Starling, an Oxford academic keen to show off his expertise in flying theory. Meanwhile Triggers is ordered to drop a British spy behind enemy lines and is shocked when the spy turns out to be an attractive young widow, Madame Boissier. When their plane suffers engine failure, they are forced to land and take refuge with a French priest. Back at base, Gaylion, now acting flight commander, refuses to order a rescue mission. While Triggers awaits the arrival of a local mechanic, Starling locates the grounded plane and destroys it, cutting off their escape route. Triggers, now out of uniform in the hope of escaping detection, and Madame Boissier are betrayed to the Germans by the mechanic. Despite the efforts of a sympathetic German defending officer, they are both found guilty of spying and sentenced to death by firing squad at dawn the following day. Madame Boissier attempts to save Triggers by revealing to the court that he is a British officer, but both are imprisoned overnight. Triggers confides in Madame Boissier about his troubled family life, and begins to feel affection for her. The Germans, having found his uniform and papers at the priest's house, make him a prisoner of war but no reprieve is forthcoming for Madame Boissier, who is shot while Triggers watches from a window. Incensed by her treatment, he escapes from the prisoner transport and returns to base, picks up a plane and strafes the car carrying the German commanding officer away from the place of execution. Only to Starling does he reveal something of his true feelings. (thetvdb.com)