In a small Catholic boarding school an unspeakable act has been committed. When High School student, Luther Scott, confesses to Father Michael Kelly, Kelly is bound silent to the particulars of a grisly murder. Now, framed guilty by the desperate teen, Kelly must decide to keep his silence or throw away everything the priesthood holds sacred.
The Cromwell clan live in the real world, except for their grandmother who lives in Halloweentown, a place where monsters go to escape reality. But now the son of the Cromwells' old enemy Kalabar has a plan to use the grandmother's book to turn Halloweentown into a grey dreary version of the real world, while transform the denizens of the real world into monsters.