The warlock is missing

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. When their parents suddenly disappear, the four Galloglass siblings--Magnus, Cordelia, Geoffrey, and Gregory--must combine the skills of their mother's power and their father's training in order to save them.