Father Brown - Season 4 Episode 7

Airman Ned LeBroc returns after eight years away, allegedly as a spy, only to discover his wife Meg, assuming he was dead, is marrying his brother Geoffrey. Daughter Millie is pleased to see him, unlike his wing commander father, who regards him as a deserter and coward. When Ned is shot dead Mallory arrests Meg but a card found in Ned's possession leads Father Brown to an unusual club which reveals Ned's secret life and the circumstances of his death.