Every Spy a Traitor'Gerlis is at the top of his game' Paul Vidich, author of Beirut Station 'Utterly gripping and startlingly compelling' Tim Glister, author of Red Corona 'One of the best spy novels I've read' I. S. Berry, author of The Peacock and the Sparrow Trust no one. Suspect everyone. It's 1937. Fear and suspicion stalk the Continent. A million have died in Stalin's Great Purge and the Nazi terror grips Germany. But British intelligence is still trying to work