Cara Logan is a lone wolf, literally -- a werewolf female unwilling to submit to either a human or a wolven mate. An expert in electronics and engineering, Cara builds herself a mate she can turn on and off at will. Only somehow, Gray becomes real, and not only can he satisfy her as a wolf, he can shift to human and perform that way, too. Now, she has to accept that she’s mated to a male with a mind of his own, and the two of them have to find their places in her pack.