The Story of the Amulet (version 2) - E. Nesbit

The Story of the Amulet is a novel for children, written in 1906 by E. Nesbit. It is the final part of a trilogy of novels that also includes Five Children and It (1902) and The Phoenix and the Carpet (1904). In it the children re-encounter the Psammead—the "it" in Five Children and It. As it no longer grants wishes to the children, however, its capacity is mainly advisory in relation to the children's other discovery, the Amulet, thus following a formula successfully established in The Phoenix and the Carpet. (Summary from Wikipedia)