|Robert Beatty||Father Phillip Elliott|
|Jack Warner||Max Cronk|
|Simone Signoret||Michele Dennis|
|Gordon Jackson||Johnny Duncan|
|Paul Dupuis||Jacques Picquart|
|James Robertson Justice||Ackerman|
|John Slater||Emile Meyer|
A Catholic priest and a Belgian expatriate are among a select group of people chosen by the British for secret operations in Nazi-occupied Belgium during World War II. After parachuting into enemy territory, the agents set out to complete a two-part assignment: destroy German information located in Brussels and rescue a fellow operative from the Nazis. However, when word arrives that one of their group is a traitor, the mission falls into jeopardy.