Mary is an English girl born in India. Her parents do not care about her, and as nobody loves her, she is lonely, unfriendly and bitter. Surprisingly, she is an orphan and is sent to England, to an uncle's country house. But this one - a widowed, sullen and sad man - is almost never there. The mansion, located in the middle of the moor, is immense, with a huge garden. In it there is a walled sector, whose door, hidden under the ivy, is locked. Ten years ago that the uncle, after the death of his wife, prohibited opening it. That secret garden and the voices and cries that the girl hears at night fill her with curiosity and propel her to discover so much mystery.