Wildlife researcher Emily befriends Ash, a mysterious silver werewolf, only to discover he remembers a promise she made to him as a child. Afraid she will disappear again, Ash locks her in a mountain cabin. As Emily recovers her memories, their bond grows, but freedom and trust remain at stake. Later Emily brings Ash to her research station, where he must learn to trust her in return. After his legal status is secured, they choose each other and welcome a daughter.