A young girl goes to work as a live-in caretaker for a spooky old woman. She doesn't know that every night, the woman drains some blood from her to feed her strange plant.

Government agents Ted Everett and Tumbleweed are sent to Spearville, Texas, where the law agencies have failed to stop a series of bank robberies. Arriving incognito, they become involved with the gang, and end up being accused of murdering banker Bartlet Mellon. They escape a lynch mob and return with evidence that Mellon has faked his death, hoping to gain the insurance, and is also leading the gang under another name.