Shattered / Kevin Hearne.

Enhanced descriptions from Syndetics:

NEW YORK TIMES BESTSELLER

Acclaimed author Kevin Hearne makes his hardcover debut with the new novel in his epic urban fantasy series starring the unforgettable Atticus O'Sullivan.
 
For nearly two thousand years, only one Druid has walked the Earth--Atticus O'Sullivan, the Iron Druid, whose sharp wit and sharp sword have kept him alive as he's been pursued by a pantheon of hostile deities. Now he's got company.
 
Atticus's apprentice Granuaile is at last a full Druid herself. What's more, Atticus has defrosted an archdruid long ago frozen in time, a father figure (of sorts) who now goes by the modern equivalent of his old Irish name: Owen Kennedy.
 
And Owen has some catching up to do.
 
Atticus takes pleasure in the role reversal, as the student is now the teacher. Between busting Atticus's chops and trying to fathom a cell phone, Owen must also learn English. For Atticus, the jury's still out on whether the wily old coot will be an asset in the epic battle with Norse god Loki--or merely a pain in the arse.
 
But Atticus isn't the only one with daddy issues. Granuaile faces a great challenge: to exorcise a sorcerer's spirit that is possessing her father in India. Even with the help of the witch Laksha, Granuaile may be facing a crushing defeat.
 
As the trio of Druids deals with pestilence-spreading demons, bacon-loving yeti, fierce flying foxes, and frenzied Fae, they're hoping that this time, three's a charm.

Praise for Shattered
 
"Funny, razor-sharp . . . Plenty of action, humor, and mythology keep this book fun and interesting." -- Booklist (starred review)
 
"Uproariously entertaining in a way that Hearne is uniquely able to achieve . . . [ Shattered ] has the feeling of a new beginning for its hero and for the series." -- RT Book Reviews

"This series just gets bigger and better, and Shattered shows no signs of it slowing down." --Vampire Book Club
 
"Well and truly awesome." --Fangs for the Fantasy
 
"So much fun to read!" --Hidden in Pages
 
"[With] clever writing and engrossing story-telling, it's impossible not to get completely absorbed into the world Kevin [Hearne] has created." --Yummy Men and Kick Ass Chicks
 
Praise for Kevin Hearne and The Iron Druid Chronicles
 
"Clever, fast paced and a good escape." --Jason Weisberger, Boing Boing

"[Kevin] Hearne is a terrific storyteller with a great snarky wit. . . . Neil Gaiman's American Gods meets Jim Butcher's Harry Dresden." -- SFFWorld
 
"Celtic mythology and an ancient Druid with modern attitude mix it up in the Arizona desert in this witty new fantasy series." --Kelly Meding , author of Tempest
 
"[Atticus is] a strong modern hero with a long history and the wit to survive in the twenty-first century. . . . A snappy narrative voice." --Library Journal , on Hounded
 
"Outrageously fun." --The Plain Dealer , on Hounded
 
"Superb . . . plenty of quips and zap-pow-bang fighting." -- Publishers Weekly (starred review) , on Hounded