Two decades ago, assassin Katherine Zhang faked her death to escape the Keepers, a secret council of witches who use magic to kill those who pose a threat to their kind. Once a powerful Keeper, she lives a solitary - but peaceful - life as a tattoo artist. Until a strange, handsome lone wolf named Marcus Delgado walks into her shop.

Marcus has his own reasons to hate the Keepers. A scientist who sacrificed himself to test the fragile boundaries between witch and wolf, he believes there’s a way to harness the combustible power between the two species. If he succeeds, he’ll be protected from the Keepers, but he needs a willing partner - and the delicious Katie just might be the perfect test subject.

Katie knows working with a wolf, an adversary she’s undeniably attracted to, is a dangerous proposition…no matter how tempting she finds Marcus’ proposal. But when a common enemy from their past threatens them both, working together might be the only option.