Ultra, the handpicked elite of British Intelligence, have planted a German double agent in Switzerland to pass on signals to the Russians. However, when German High Command begins to suspect false play, they plant their own agent in Switzerland to investigate. Only one man, one-armed Major Cain, has a chance of finding that agent.
Used availability for Charles Whiting's Double Cross
1978 : UK Hardback
January 2008 : UK Paperback
May 1977 : UK Paperback