When a small town doctor buries his twin brother, a practitioner of the black arts, he believes him dead; but subsequent events force him to realize that his brother has, in fact, returned from the dead as a vampire and is seeking revenge on the doctor, who had killed him in self-defense.

On the night express train from Los Angeles to San Francisco everyone’s a suspect when a jewelry magnate is found stabbed to death and an escaped killer is feared on board. It’s up to newspaper reporter Jimmy Hawley (Ben Lyon) to unravel the secrets of the motley group of passengers and find the killer before he strikes again in this tense and atmospheric whodunit.

故事讲述一位野心勃勃的科学家发明了一种隐身药剂。虽然亲身实验成功但却没法还原。无奈下他离家出走投宿于某偏远小镇客栈。希望能隐居起来专心研究解药。可不料事与愿违。他的怪异的打扮举止惊扰了小镇的居民，并导致了警方的介入。最终不得以他脱去外套隐身逃往，并展开的疯狂的报复……