Rich man's daughter throws over her nerdy boyfriend when she gets a taste of the real thing from one of her daddy's construction workers. Meanwhile, there's a crooked labor contractor posing as an agitator and trying to provoke a strike.
To win the prize that is offered to the one who endures three laps to a boxer, a mechanic learns to box and becomes champion; in the meantime he gets involved with a woman but eventually returns to his wife.
