A retired FBI agent, Frank Devlin, is rehabilitating in a Las Vegas health care facility when something unusual awakes him during the night. There's a giant standing in his doorway. After a few moments, the shadow of the large man continues its journey down the hall, disappearing from sight. Devlin's curiosity is peaked, and he decides to investigate what's going on. Of course, he forgot that old saying about how curiosity killed the cat.