A captivating adventure story with huge heart and dazzling imaginative power, from the bestselling author of An Instance of the Fingerpost. Three interlocking worlds. Four people looking for answers. But who controls the future – or the past?In a professor's house in Oxford, fifteen-year-old Rosie goes in search of a missing cat – and instead finds herself in a different world. Anterwold is a sun-drenched land of storytellers, prophecies and ritual. But is this world real – and what happens if she decides to stay?Meanwhile, in a sterile laboratory, a rebellious scientist is trying to prove that time does not even exist – with potentially devastating consequences.