Druid Atticus O’Sullivan hasn’t survived for more than two millennia without a fair bit of Celtic cunning. So when vengeful thunder gods come Norse by Southwest looking for payback, Atticus, with a little help from the Navajo trickster god Coyote, lets them think they’ve chopped up his body in the Arizona desert.

But the mischievous Coyote is not above a little sleight of paw, and Atticus soon finds that he’s been duped into battling bloodthirsty desert shapeshifters called skinwalkers. Just when the Druid thinks he’s got a handle on all the duplicity, betrayal comes from an unlikely source.

If Atticus survives this time, he vows he won’t be fooled again. Famous last words.

Thor, the Norse god of thunder, is more than just a blowhard and a bully—he’s ruined countless lives and killed scores of innocents. After centuries, Viking vampire Leif Helgarson is ready to get his vengeance, and he’s asked his friend Atticus O’Sullivan, the last of the Druids, to help take down this Norse nightmare.

One survival strategy has worked for Atticus for more than two thousand years: stay away from the guy with the lightning bolts. But things are heating up in Atticus’s home base of Tempe, Arizona. There’s a vampire turf war brewing, and Russian demon hunters who call themselves the Hammers of God are running rampant.

Despite multiple warnings and portents of dire consequences, Atticus and Leif journey to the Norse plain of Asgard, where they team up with a werewolf, a sorcerer, and an army of frost giants for an epic showdown against vicious Valkyries, angry gods, and the hammer-wielding Thunder Thug himself.