In 1994, a toddler goes missing in a small Welsh village. The girl is never found again. 23 years later, London cellist Matilda is eager to solve the mystery surrounding her mother's suicide. She goes on a quest to learn more about her family's past and links the suicide to the young Welsh girl's disappearance. This brings her to an ominous mansion full of secrets, on a dark and perilous journey back in time.