Minty has always been able to sense things—chills in empty stairways, whispers on the wind, and the presence of something not quite seen. When her mum is in recovering from an accident, Minty explores the garden of the old house where she’s staying and stumbles across a moondial—one that opens a gateway to the past. There she meets Tom, a frail servant boy, and Sarah, a girl marked by superstition and hidden from the world. Minty wants to help, but time is running out—and the past doesn’t always let go easily.