Seeking escape from her boring life in Peyote Pass, New Mexico, Sally Jennings moves to Baltimore, MD. On her first Christmas Eve in "the big city" she rescues from a dumpster, a freezing puppy She takes it home, cleans it, feeds it, and loves it to pieces. Of course it loves her to pieces too. Soon she learns that her pet is not a German Shepherd but an Alaskan gray wolf which she names Maximus Rex, Max for short. Nettie is a stunningly beautiful prostitute by day, and a ravenous werewolf by night. One evening while strolling in the park, Sally is attacked by the werewolf. Max lunges to her rescue, and although Sally is unharmed, Max is seriously bitten. According to legend, if a man is bitten by a werewolf and does not die, then on nights of the full moon, that man becomes a werewolf. What then would happen to wolf that is so bitten? Would it not, on nights of the full moon, turn into a man? So it is with Max. Predictably, Sally and Max fall in love and many humerous, romantic, and terror filled adventures ensue as together they strive to vanquish the werewolf, and as Max is a man only on nights of the full moon, find a way to keep him human on a more permanent basis.