One girl on a lonely island. One secret, deep underground. One chance to find a family. An adventure for 8 - 12 year-olds, about digging for treasure, family secrets - and one girl's determination to save what she loves. The story begins when Effie is transported to a wild and remote island, her mother's childhood home. At first, she finds the roaring sea and howling wind strange after the city. Luke, Effie's cousin, lives on the island and so does Raine, her fierce archaeologist grandmother. Raine won't forgive Mum for leaving home at sixteen but she rents them Crow House with its crumbling walls and spiders' webs. There are secrets to uncover and hidden treasures, too. When Effie accidentally finds a golden brooch, she starts to dig for the treasure chest she knows is right under her feet. Little by little, as she explores its beaches, sea-caves and open meadows, the island grows on her, and Crow House becomes the home she's always wanted. Then it all goes wrong. Forced to take risks, can Effie dig fast enough to save everything she loves?