When they complete their training, three of Sharkey's pupils, Frenchwoman Suzanne de Beaumont (Annabella), American Jeff Lassiter (Frank Latimore), and Kuncel, are sent on two separate missions into German-occupied France. Sharkey tells Lassiter about Kuncel beforehand so he can keep watch on the traitor. However, when Kuncel casually talks to Lassiter, the inexperienced man lets his uneasiness show, alerting Kuncel. On the transport plane, Kuncel secretly cuts Lassiter's parachute cord, causing him to plummet to his death when they jump.
Sharkey volunteers to be Lassiter's replacement. He and de Beaumont complete their mission (freeing and getting a man named Duclois back to England), but she is killed and Sharkey is captured. He is tortured by Kuncel, but refuses to talk. Back in England, Gibson has no choice but to order a bombing raid to silence Sharkey, who knows too much. When the bombing starts, Sharkey understands what is going on and laughs in Kuncel's face just before they both perish.