The Secret Garden
"The Secret Garden" by Frances Hodgson Burnett is a children's novel first published in 1911. When orphaned Mary Lennox arrives at her uncle's gloomy Yorkshire manor, she discovers a locked garden that has been abandoned for ten years. As Mary uncovers the garden's secrets, she befriends a nature-loving boy and finds her bedridden cousin Colin hidden away in the house. Together, the children work to restore the forgotten garden, and in doing so, begin transforming themselves and those around them.
Wikipedia page about this book: en.wikipedia.org/wiki/The_Secret_Garden