One night, Callum is driven into the woods by instinct, an instinct to protect. In the form of a wolf, he meets a young human child to whom he is instantly drawn in a fierce way he doesn’t quite understand.

Sonia Arlington has lived a lonely life. She possesses certain abilities that make her strange and she suffers from a rare disease that, if untreated, could be fatal. Her father makes her vow to never let others discover her abilities, forcing Sonia to stay distant, always guarding against exposure.

Intelligence leaks that Sonia is Callum’s human mate. Now King of the Werewolves, he has war on his hands and is forced to claim his mate, integrating Sonia into a world that is both strange and frightening.

As Sonia attempts to adjust, Callum grapples with the knowledge that his mate is mortal. He will have her beauty and gentleness only for the length of a mortal life, making their union unbearably bitter even as Sonia makes it unbelievably sweet.