Foyle's War: The Eternity Ring

It's 1946 and although one war has ended, another is looming as the Iron Curtain falls across Europe. Foyle arrives home from America, where he is wanted in connection with a suspicious suicide, but MI5 offers him a way out. The agency suspects Britain's atomic research programme has been infiltrated and wants to recruit him to investigate a Soviet spy ring that could be at work in the heart of London. Detective drama, starring Michael Kitchen, with Honeysuckle Weeks, Ellie Haddington and Dylan Charles