The Prize of Colonel Gerard

Edward Gerard, a prisoner of war who returns from North Korea sympathetic to his captors, greatly displeases his martinet uncle, Colonel Cecil Gerard (Nicholas Jones), who threatens to commit him to an asylum. When the Colonel is murdered, the suspects include the nephew, the Colonel's daughter (an adopted Chinese girl) the nephew was going to run away with, the brother-in-law, and the victim's wife. Father Brown finds the solution lies in the family history and the Colonel's sexual intentions to his adopted daughter.