Lorina, a young schoolgirl, is led by a black rabbit through a wood to a magical land. There she finds a a race of green people, who are all overworked, starving and subjected to the toxic fumes billowing out of a nearby castle. She decides to gain access to the castle on behalf of the poor green people, and within its walls she meets the insiders , selfish creatures who hoard all the resources and treat the outsiders as slaves. Her quest leads her to encounter the bureaurat, the superviper, the farmadillo and, eventually, the awful Piggident himself.

Wonderfully illustrated by Chris Riddell, The Castle of Inside Out is an unforgettable and hilarious tale of adventure, set in a world where injustice and arrogance are widespread and must be countered by its courageous and compassionate heroine.