March 1348. Crowfield Abbey is starting to collapse.
William is given the job of repairing floor tiles in a haunted side chapel. There he finds a box from an earlier, pagan time, containing a small wooden bowl, covered with strange warnings and symbols.
The bowl is cursed and a hideous demon is unleashed within the Abbey's walls. It will wreak unspeakable havoc unless Will and his friends can summon help in time.