Secret World of Og, The

This lengthy (160 pages) classic fantasy tells the story of four children who set out in search of their baby brother who has disappeared mysteriously from their playhouse. They descend through a secret trapdoor into an underground world of brightly coloured mushrooms. The place is inhabited by little green people who treat all the old make-believe toys and objects they’ve collected as real. The only word they know how to say is “Og”.