The Secret Garden by Frances Hodgson Burnett

A young, spoiled and unloved girl is sent to live with her reclusive uncle in a large, lonely house after the death of her parents. Through the discovery and cultivation of a hidden, neglected garden, she befriends a local boy and her sickly cousin, and the three children find healing and transformation through their friendship and the magic of the garden.

The 531st greatest book of all time