British author Peter Dickinson, creator of The Changes trilogy, has died aged 88.

The writer of over 60 books, Peter Malcolm de Brissac Dickinson won two Carnegie Medals as well as two Crime Writers Association Golden Daggers, and was well-known for both his crime fiction and his children’s work. His trilogy of stories about an altered England was adapted as The Changes in 1975 for BBC TV, and he wrote two alternate history books, King and Joker and Skeleton-in-Waiting, as well as various Tales of Elemental Spirits with his wife, Robin McKinley.