In this episode of the PBS series "Mystery," Scotland Yard sleuth Michael Jericho (Robert Lindsay) must unravel the secret life of track star Johnny Swan (William Ash) when he and his bride are found brutally murdered. There are raised eyebrows about town. With a much-touted rematch against Soviet champion Vladimir Vukic (Toby Lambert) -- whom Swan had defeated a year earlier -- only days away, suspicions of retaliation by the KGB surface.