Michael Young is a brilliant young history student whose life is changed when he meets Leo Zuckerman, an ageing physicist with a theory that can change worlds.
Together they realise that they have the power to alter history and eradicate a great evil. But tinkering with timelines is more dangerous than they can imagine and nothing - past, present or future - will ever be the same again.
'The tensions and resolutions are intrinsically comic, made still more enjoyable by [Fry's] sinuous invention and cleverness at caricature' Spectator
'Sprightly and entertaining' Telegraph
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