Five Children and It by NESBIT, E.

This delightful novel begins when a family of five children moves from London to the English countryside. While playing in a gravel pit soon after the move, they discover an ancient and rather grumpy sand-fairy known as the Psammead, who agrees to grant one wish of theirs per day. The children’s wishes send them on adventure after adventure, but rarely turn out as expected. (Summary by Kara)