Spirit of the Season is a somewhat tongue-in-cheek supplement for the Spirit of the Century game. Don't get me wrong its well done, and more than a little fun, but turning Santa into a gadgeteering pulp hero is a bit out of the ordinary.
The booklet provides a nice selection of Christmas and Hanukkah-themed characters. Nick Saint, for example, is assisted by his Reindeer Men—each of whom is written up a playable character.
If the book has a weakness, its that most people are only going to be interested in its theme once a year. Even so its a fun addition to SotC and at a bargain price to boot!