Cyril is off to fight, Anthea is at art college, Robert is a Cambridge scholar and Jane is at high school. The Lamb is the grown up age of 11, and he has a little sister, Edith, in tow. The sand fairy has become a creature of stories ...until he suddenly reappears.

The siblings are pleased to have something to take their minds off the war, but this time the Psammead is here for a reason, and his magic might have a more serious purpose. Before this last adventure ends, all will be changed, and the two younger children will have seen the Great War from every possible viewpoint - factory-workers, soldiers and sailors, nurses and the people left at home, and the war's impact will be felt right at the heart of their family.