Fr Elliott, Robert Beatty, a Roman Catholic priest, is summoned to the Natural History Museum to meet a section-head of the wartime British Special Operations Executive. On agreeing to train for covert operations behind enemy lines in Belgium, he is introduced to a diverse cohort of recruits: Michèle, Simone Signoret, a Belgian émigrée whose sweetheart died during the occupation; Emile, John Slater, a man who longs for his family; and Julie, Gisèle Préville, who flirts with Fr Elliott even though he remains celibate. Michèle’s motives are initially questioned, but she is ultimately cleared to operate abroad, and the team begins a demanding program of training designed to prepare them for high-stakes missions behind enemy lines.
When training ends, Fr Elliott and Julie are parachuted into Belgium with a dual objective: destroy a Nazi records office in Brussels and spring a prominent SOE agent, Andrew, from custody. The mission is perilous and personal, and tragedy strikes when Julie is killed during the drop, leaving the rest of the group to carry on under pressure.
Back in Belgium, Emile undergoes plastic surgery to re-enter operations and discovers that his wife has managed to leave occupied Belgium. He sets out to meet her, risking his own clearance and future status. Meanwhile, another recruit, Max, meets his German contact and contemplates betraying the Belgian network for money. The team—Max, Emile, Michèle, and Scotty Duncan, Gordon Jackson—are flown in, but Belgian authorities flag the Irish contact on their watch list, branding Max a double-agent even before the mission truly begins. The decision to proceed is made, and before long the group is in the air and on their way to their target. It isn’t long before Michèle discovers Max’s treachery, and she executes him after receiving a radio message confirming his betrayal. A complicated web of loyalties deepens, and Michèle begins to fall for Scotty.
The core objective—the destruction of the records office—goes ahead, while Jacques Picquart, Paul Dupuis, an SOE agent operating undercover as a Belgian Fascist Quisling, works to relay crucial information to Fr Elliott about Andrew’s prison arrangements. An attempted rescue is interrupted by an untimely RAF bombing raid, scuppering their plan. Scotty endures a painful toothache caused by the damp church-crypt hideout, and his poor French accent leads to his arrest by the Gestapo. Jacques stages Scotty’s escape, but at a terrible personal cost: his cover is blown and his life is lost. With their ranks damaged but their resolve intact, the remaining agents improvise, hijacking a train carrying Andrew toward Germany. They dodge pursuit and manage to secure Andrew aboard a night-flight back to Britain, completing a dangerous, high-stakes operation that tests trust, courage, and the limits of loyalty under occupation.
