Sherrilyn Kenyon 
Born of Fury [EPUB ebook] 
Number 6 in series

The war is on . . .Counted among the fiercest Andarion warriors ever born, Hauk is one of the five founding members of the Sentella – an organization that has declared war on the League that rules the Ichidian universe with an iron fist and terrifies it with an army of well-trained assassins. But Hauk fears nothing and no one. He will do whatever it takes to survive and protect his Sentella brethren.Sumi Antaxas is one of the best assassins the League has ever trained. In her world, failure is not an option and she has never met a target she couldn’t execute. So when she’s assigned Hauk, she believes it’ll be a quick and easy mission.But nothing is ever as simple as it seems, and Hauk is far better trained and skilled than she imagined. In the race to report information that could bring the Sentella down, she suddenly becomes the hunted. Now her only key to survival is the one man she’s been sent to kill. And Hauk doesn’t trust her at all . . .