A delectable chrismas classic - Now with mayhem!
The wide wicked world is a very dangerous place, especially for not-quite so big leeches who wish nothing so much as to be left out of thing such as wars, and wizards, and spells.
It looks like a cook's book. It is a cook's book. It is also where the cook, who happened to be a master spy, encoded all his secrets and contacts. The book has innocently fallen into your group's hands. Everyone wants it, and many are not subtle or peaceful in their attempts.