A Major is murdered on an army base by a legendary broken sword; during commemorations of the men killed during the evacuation of Dunkirk. The sword belonged to the regiment's Colonel who used the sword to charge an enemy position with his men. Father Brown has to uncover the secret of two murders; being kept to uphold the honour of the regiment.
Elenco: Mark Williams , Sorcha Cusack , John Burton , Jack Deam , Nancy Carroll , Emer Kenny , Alex Price , Tom Chambers , Hugo Speer .