When the mysterious, beautiful Elleander Morning travels through time to Vienna in 1913, her aim is not to visit the birthplace of Schubert and Strauss. Instead, she has come to assassinate a struggling young artist. His name: Adolf Hitler.

But 60 years on, long after Elleander has changed the path of the world, a mysterious book - the history of a terrible, global war that never was - threatens to unravel reality. As the horrific past - a past that never happened - begins to reassert itself, billions of lives lie in the balance . . .