Hildy Frericksen is a young American archaeologist with a passion for Vikings. While working on a dig in Caithness, she uncovers a Viking longboat burial and is very surprised when the passengers turn out to be not dead but merely sleeping. When they awake, the leader turns out to be Hrolf, last King of Caithness, reawakened to fight the evil sorcerer-king who wants to rule the world. Hildy has to help the Vikings in their quest to hunt down the sorcerer-king and defeat him, helping them to cope with the modern world along the way. There are many amusing characters among the Vikings, especially Starkad the Berserker (strong but stupid) and Brynjolf the Shape-Changer. The Vikings have to cope with a number of modern complications in their quest, from the SAS to the London Underground, but they take everything in their stride. There are also two cthonic spirits, Prexz and Zxerp, who are addicted to playing Goblin's Teeth, live off electricity and play havoc with the National Grid. This is a very funny fantasy, by the end of the story you will be as enchanted with the Vikings as Hildy was.In my opinion, Tom Holt's best book by far.