In June 1971, Alice Sanders is celebrating her sixth birthday at her family's Cornish country home in Lostmor. By the end of the evening, an event has occurred that is so horrific it will change the family's lives forever. Years later, following the death of her mother, Alice's sister, Lily, reluctantly returns to Cornwall for the reading of a mysterious will. Once there, with the help of new-found friends, she unravels a web of secrets surrounding her family's past, finds love, and unlocks the reasons for the nightmares that have plagued her since that fateful night.