Story of the Amulet - Edith Nesbit - Bog

While the childrens mother and father are out of the country the children are staying with the "old nurse" in her boarding house. There is only one other boarder, an old Egyptoligist, whom the children soon befriend. They learn of an amulet that has the ability to grant their hearts desire, and soon buy it. After making the purchase, they learn that it is the only surviving half of the amulet.