Sarah Jensen is the town witch of Buck Lake, Tennessee. What she misses most is her older brother and his best friend Reeve, who are serving overseas in the Marines. But when her brother dies in battle, Reeve returns home, cursed and doomed to turn into an insatiable wolf every full moon. Sarah also has her own secret - she has been head over heels in love with this man since childhood. When he comes to her house on Halloween night asking for help, she accidentally casts a fidelity spell on him in an attempt to contain his beast. Sarah realizes that she is taking on a difficult and dangerous mission by breaking the spell. But when the wolf is driven out of Reeve, the spell of fidelity will also disappear, as will his love for her.