Eleven-year-old Ailsa Craig is always late. To everything. To school, to her own birth, even to her own house exploding, though being late for that one is no bad thing. Then she stumbles on the secret of a lifetime: a hidden twenty-fifth hour in the day. The Magic Hour exists in a dazzling parallel Edinburgh, reached only at twilight, a place where anything seems possible. Suddenly her grades are up, life is looking golden and even the popular kids want to know her. But messing with time carries a terrible price, and when Ailsa discovers what that extra hour really costs, she must take on the sinister forces behind it to save herself, her parents and the world. A fast-paced, time-twisting adventure where every second counts.