The warlock is missing
Christopher Stasheff (Author), Stephen Hickman (Illustrator)
On the magical planet Gramarye, warlock Ron Gallowglass and his witch wife Gwen are kidnapped and held captive in another time dimension and their children--Magnus, Cordelia, Geoffrey, and Gregory--attempt to locate and rescue their parents. NjBwBT
Print Book, English, 1986
Ace Science Fiction Books, New York, 1986