Ethan’s Mate by J.S.SCOTT

Ethan Hale is a vampire with a mission. Together with his three brothers and a few other unmated members, he fights with The Vampire Coalition to protect humans from fallen vampires. His life is fairly simple. If he has a problem...he solves it. If it's an evil problem...he kills it. But his uncomplicated life is about to end when his mate unexpectedly calls him to her.

Brianna Cole is weak, her life force fading away. She thinks she is suffering from a rare form of leukemia. Little does she knows that her illness is much more complicated. She's dying because she has not united with her vampire mate and given him his soul that she has been guarding since birth.