To defeat Thor, the Norse god of thunder who has killed scores of innocents, Viking vampire Leif Helgarson teams up with Atticus O'Sullivan, the last of the Druids, a werewolf, a sorcerer, and an army of frost giants.

Two-thousand-year-old druid Atticus O'Sullivan, Granuaile and the wolfhound Oberon race across modern-day Europe to try to escape the clutches of Olympian goddesses Artemis and Diana and the Norse god of mischief, Loki.

"Iron Druid Atticus O'Sullivan, hero of Kevin Hearne's epic New York Times bestselling urban fantasy series, has a point to make--and then drive into a vampire's heart. When a druid has lived for two thousand years like Atticus, he's bound to run afoul of a few vampires. Make that legions of them. Even his former friend and legal counsel turned out to be a bloodsucking backstabber. Now the toothy troublemakers--led by power-mad pain-in-the-neck Theophilus--have...

"Unchained from fate, the Norse gods Loki and Hel are ready to unleash Ragnarok, a.k.a. the Apocalypse, upon the earth. They've made allies on the darker side of many pantheons and there's a globe-spanning battle brewing that ancient Druid Atticus O'Sullivan will be hard pressed to survive, much less win. Granuaile McTiernan must join immortals Sun Wukong and Erlang Shen in a fight against the Yama Kings in Taiwan, but she discovers that the stakes...