Plot summary
Small-time gambler Ace Larsen discovers that his partner, Jimbo Cobb, has telekinetic powers after a car overturns outside their café, and Jimbo moves the car without touching it.
Ace plans to use Jimbo's powers to win big in Las Vegas, and he takes his girlfriend Kitty with them. Ace wins every bet he makes, disregarding Jimbo's headaches from the use of his powers and his growing moral concerns over what they are doing, and accumulates hundreds of thousands of dollars in winnings. Kitty becomes disgusted with Ace's behavior and leaves, so Ace hires the casino's cigarette girl as his companion for the night and has the manager call Phil Nolan, a notorious gangster from Chicago. Ace and Nolan begin a private game of craps, with Ace winning roll after roll.
Ignoring Jimbo's interruptions, Ace decides to bet all his money on the next roll, but unexpectedly loses; Jimbo says afterward that his powers had suddenly failed him. The loss awakens Ace to the reality of what he has become, and Jimbo and he have a good laugh over their misfortune and return home with Kitty.
Back at the café, Ace asks Kitty to marry him just as Jimbo drops his broom. She flips a coin, and Ace calls "heads". Without showing Ace the coin or telling him the result of the flip, she decides to accept his proposal. As they embrace, Jimbo picks up the broom telekinetically, revealing he faked his loss of power to snap Ace out of his greed.
Credits
Adapted from Wikipedia contributors, The Prime Mover. Paragraphs and formatting adjusted; illustrations, reference markers, block quotations and non-story material omitted.