Part fiction, part fact, this work starts with a short story. Esi is careless about turning off taps. To show her how precious water is, Esi's mother tells her the story of Iddi, who wanted to find the greatest treasure in the world, expecting it to be jewels but finding it to be water. The accompanying fact file on deserts looks at desert environments, showing how important water is to living things, and how plants and animals adapt to a life with very little water.