When a public building made with inferior concrete collapses, motorcycle policeman Spencer "Speed" Haynes is sworn to apprehend those responsible. Speed's girl friend, Dorothy Thompson, is unaware that her father James, who oversaw the construction, has been an unwitting accomplice in the scheme of gang leader Richard Webster. With the help of absent-minded newspaper reporter "Peek" Harvey, Speed exposes Webster as the man responsible and saves James Thompson from ruin.