Feral Claws by Brooke Saylor

In a world where werecats roam free, seeking territory and hunting prey, Juniper thinks she has finally made peace with her past. Six years after the murder of her parents, her first shift, and her first kill- everything is different.
River Vaughn saved Juniper during the toughest time of her life. He helped her realize her true nature, something no one else bothered to do. They compliment each other in a way that is rare in the werecat society, and nothing can stand between the two mates.
When a rogue cat comes to town, he threatens the security of the life Juniper has built around her. This stray has come for blood, and he will do anything to get it… Will River be able to protect Juni when she becomes the prey, or will she be alone once again to face the beast?