Racecar-driver Lou Larrigan gets mixed up with a crooked gang of racetrack promoters, and is in love with Ruth Morgan, whose father is marked as a victim by the gang.
Tom Brown shows up at Harvard, confident and a bit arrogant. He becomes a rival of Bob McAndrew, not only in football and rowing crew, but also for the affections of Mary Abbott, a professor's daughter.
A mad captain poses as a cleric to murder people aboard a fogbound ship.
During World War I a young man joins the army and winds up befriending another young recruit, not knowing that it's the same pickpocket who stole his watch. After finishing basic training, the two are sent to the front lines in France, where they wind up in trouble with the MPs, getting involved with some cute French girls and "volunteering" for a dangerous front-line mission, and their antics result in their endangering the armistice.