Set in a dark fantastic past of myth and magic, Klaus tells the story of how Santa Claus really came to be. Where did he begin? What was he like when he was young? And what happens when he faces his greatest challenge? Drawing on Santa Claus' wilder roots in Viking lore and Siberian shamanism, taking in the creepier side of Christmas, and characters like the sinister Krampus, Klaus is Santa Claus: Year One.