A series of grisly murders plague a small mountain community and the sheriff suspects a local scientist whom he dislikes. Together with a former professor and the professor's pretty daughter, the scientist sets about solving the crimes and discovers the killer is an oversized 16th century conquistador, resurrected by a lightning bolt from his mountain grave.

Abigail Chandler has written her stuffy Boston relatives that she's a successful opera singer in New York. In reality, she works at a burlesque house and is billed as High-C Susie. When her sister Martha comes for a visit, Abigail tries to hide the truth from her.

Stephanie and Terry are identical twins who have been raised separately since their parents divorced seven years earlier. Each envies the lifestyle of the other; and they decide, without telling Jeff or Mary, to switch families for a day or two. They soon find that it is harder to do what the other person is expected to do, and that looking alike is not enough. When they find that their charade may bring their parents back together, they agree to continue it. A major complication begins when Alice, Jeff's girlfriend and co-worker, finds out the real story.

On a trip to visit his parents, detective Nick Charles gets mixed up in a murder investigation.