In 1962 Garner began work on a radio play named "Elidor", which would result in the completion of a novel of the same name. Set in contemporary Manchester, "Elidor" tells the story of four children who enter into a derelict Victorian church, in which they find a portal to the magical realm of Elidor. Here, they are entrusted by King Malebron to help rescue four treasures which have been stolen by the forces of evil who are attempting to take control of the kingdom. Successfully doing so, the children return to Manchester with the treasures, but are pursued by the malevolent forces who need them to seal their victory.