When the magician Koschei escaped through the mind of his creator, Guy Parados, into the world where he is fiction, he became Guy Parados. And Parados became the Red Horse in the land of Malthassa . . . his own invention, he believed.
Used availability for Gill Alderman's Lilith's Castle
June 1999 : UK Paperback
January 2017 : USA, Canada, UK Kindle edition