A wealthy scientist dies and his heirs are called to his gloomy mansion for the reading of the will. As thunder explodes and lightning flashes, a murderer runs loose in the dark hallways and hidden passages. It is a night of terror for the house guests as they face death at the hand of an unseen killer. A vintage old house thriller, <i>The Monster Walks</i> was directed by Frank Strayer, known for many independent features including <i>The Vampire Bat</i>, <i>Condemned to Live</i> and <i>The Ghost Walks</i>, as well as at least twelve entries in the long-running "Blondie" series.