When college student Bill Perry grows inappropriately fond of psychology professor Wilma Tuttle and tries to rape her, her self-defense inadvertently kills him. Wilma then moves Bill's corpse to a nearby beach and makes his death look like the result of a cliff diving accident. But her guilt over the incident builds, and Lt. Ted Dorgan begins to suspect that Wilma knows more than she's letting on.
Cleve Marshall, an assistant district attorney, falls for Thelma Jordon, a mysterious woman with a troubled past. When Thelma becomes a suspect in her aunt's murder, Cleve tries to clear her name.
The residents of a small town are excited when a flaming meteor lands in the hills, until they discover it is the first of many transport devices from Mars bringing an army of invaders invincible to any man-made weapon, even the atomic bomb.
Career gambler Dan Milner agrees to a $50,000 deal to leave the USA for Mexico, only to find himself entangled with fellow guests at a luxurious resort and suspecting that the man who hired him may be the deported crime boss Nick Ferraro aiming to re-enter to the USA.
