The Book of Wolves

Ciann O'Banyon never wanted Immortality, but that's what he got. Over eight hundred years old, he is now a member of the Order of Wolves; an elite fighting force that combats Rogue Immortals and protects the race from discovery. He lives only to fight. Nothing more. Nothing less.
His new assignment is nothing different from the thousand before it. Protect a book. Protect a book and the Mortal who possesses it.
A female Mortal.
And Airen Mabry is more tempting than any female Mortal should be. Beautiful and intelligent, her kindness and strength succeed in touching him in a place he thought lost long ago. The part he hasn't dared feel in centuries.
But forces are moving swiftly against them and time is running out.
In a night of blood and retribution, Ciann and Airen are forced to make choices that could tear them apart forever...