The World Of Poo by Terry Pratchett is published in hardback by Doubleday, priced £12.99. Available now.

Geoffrey is a young boy with a passion for poo, so when he is sent to stay with his surprisingly tolerant Grand-mama in the big city of Ankh-Morpork, he starts collecting exhibits for a special museum.

As he collects bird, dog, hippo, wyvern and gargoyle droppings, he meets people who rely on waste to make a living, from lowly night soil men and aristocratic lavatory inventors to entrepreneurs who know that where there's muck, there's brass, and "white pearls" fetch a good price from the leather tanners.

Terry Pratchett's hugely successful Discworld series has spawned a number of spin-offs, and there are many references to established characters. But grown-up fans, their young children and first-timers should all enjoy this scatological addition, which is filled with puns and snippets of unexpectedly fascinating information.

After all, who hasn't wondered about how the world worked before plumbing?
(Review by Natalie Bowen)