In the bustling and vibrant Los Angeles of the late 1920s, a group of young car enthusiasts plunges into the culture of "speed racing," a phenomenon that stirs adrenaline and excitement at every corner. The story follows Dominic, an exceptionally talented mechanic who dreams of competing in the most thrilling illegal races in the country. However, his life takes an unexpected turn when he crosses paths with Letty, a fearless driver who breaks all the rules of the game, both on the tracks and in her personal life.