A War of Wizards by Margaret Storey

Title: A War of Wizards
Author: Margaret Storey
Illustrator: Janina Ede
Publication: Faber & Faber, hardcover, 1976
Genre: Juvenile fantasy/series
Setting: Britain

Description: In an earlier book, Timothy went to stay with Melinda, a white witch, who lives in an amazing house in London, where he became friendly with Ellen, a girl his age.