The movie begins in Southern England in the Middle Ages and then six knights are seen riding in horses towards a destroyed town. They see the remains of burned buildings and dead people until they come upon a mother and her dead baby. She quickly dies and then a rhino-sized dragon flies overhead, the knights follow right behind, vowing to kill the creature.

A former FBI profiler, now a sheriff of a small town and a single parent of a high school aged daughter, begins to profile a series of unexplained murders only to learn that the monster he's profiling may be himself.