E Nesbit 
Story of the Amulet 

When Cyril, Anthea, Robert and Jane find the Psammead, a magical sand fairy, in a pet shop in London, they have no idea that they are about to embark on their greatest adventure yet. The Psammead leads them to an Egyptian amulet that has the power to grant whatever their hearts desire. The problem is that the amulet is broken, and the other half – needed if their wishes are to be granted – is lost. Yet with their half of the amulet able to transport them through time, the children set out on a search for the missing half, and the realization of their wildest dreams…From an encounter with Julius Caesar to a visit of the lost city of Atlantis, The Story of the Amulet – the final instalment in the Psammead Trilogy – is an unforgettable tale of magic and time travel that has been loved by children and parents alike for more than a century.