Book excerpt: An epic, heart-wrenching follow-on from E. Nesbit's Five Children and It stories. The five children have grown up and World War I has begun in earnest. 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, for the first time in 10 years, 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 ambulance drivers, and the people left at home, and the war's impact will be felt right at the heart of their family.