Drama set in an Italian prisoner of war camp during World War 2, where a group of British soldiers find their plans for escape thwarted by a mysterious traitor in their midst.

John Lewis is bored of his job and his wife. Then Liz, wife of a local councillor, sets her sights on him. But this is risky stuff in a Welsh valleys town - if he and Liz ever manage to consummate their affair, that is.