After the flood, a fisherman and his wife live on an old ship. The sea has swallowed the land, the cities have sunk, and the fish have almost disappeared, so the fisherman and the woman are barely surviving.
At the end of each booklet, there are instructions and tips for parents and teachers on how to best use them, as well as a glossary of the most important new terms from the book. They are intended for children of early preschool age.