There's nothing normal about Alan Normalton. His favourite habits are bottom burping and picking bogies from his nose. What's more, he was born with only four and a half toes on each foot and his skin has a faint greenish tinge. One day, he asks his mum why he's not like other boys.
Alan soon finds himself drawn into a dangerous forest filled with entertaining and disgusting monsters, who quickly become his friends. But not everybody likes Alan's new friends. In fact, some people find them very scary indeed.
After his little sister is kidnapped and carried deep into the forest, Alan must decide who to side with – his sister or his new monster buddies.