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

Sonia Arlington has lived a lonely life. She has certain abilities that make her strange and she has a rare disease that, if untreated, could kill her. Her father makes her vow that she will never let others discover her abilities. This forces Sonia to stay distant, always guarding against exposure.

Intelligence leaks that Sonia is Callum's human mate. He is now King of the Werewolves and has war on his hands. He's forced to claim his mate and integrate Sonia into a world that is strange and frightening.

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