Wolf's Rogue
Wardens of the Other Worlds, Book 3

Werewolf billionaire Zach knows only one thing: he and Stella, an assassin from an opposing pack, were meant to be together. But their mating bond did not take, so he has condemned himself to being alone while she has returned to her life as a killer for hire. When fate pulls them together again, her pack needs his help and his money, and Zach will follow her into danger to prove that what is between them is real.