Psammead trilogy

When four brothers and sisters discover a Psammead, or sand-fairy, in the gravel pit near the country house where they are staying, they have no way of knowing all the adventures its wish-granting will bring them.

The Story of the Amulet - Edith Nesbit - The magic Psammead is back! This time the four children, Cyril, Robert, Anthea and Jane are stuck in London for the Summer, when they come across the Psammead (or wish-giving sand-fairy), imprisoned in a pet shop. They manage to free him, and he tells them where they can get hold of a magic amulet which will bring them their hearts' desire. Unfortunately when the amulet is secured, it is incomplete. They and...