The postcard has been held at the sorting office for ninety-one years, waiting to be delivered to Joe Tournier. On the front is a lighthouse - Eilean Mor, in the Outer Hebrides. Joe has never left England, never even left London. He is a British slave, one of thousands throughout the French Empire. But he has flashes of a life he cannot remember and of a world that never existed - a world where English is spoken in England, and not French. An enthralling, epic, unforgettable time-slip story.