This is a captivating adventure story with huge heart and dazzling imaginative power, from the best-selling author of An Instance of the Fingerpost. Three interlocking worlds. Four people looking for answers. But who controls the future - or the past? In the basement of a professor's house in 1960s 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.