Spells in Secret

Magical doors and other mischief mix badly with tales about murder, as young scholars return to Graytowers. Kenneth, as prefect, thought he had his hands filled with the beginning of the new session, but when one magical door takes him and another scholar far past the bounds of a prank, they barely escape with their lives, and their escape means only that they are in graver danger.  They must hide, leaving the school, and casting all their spells in secret.