A Cadet, Roy Rupple, tries to cross the frozen Hudson river to visit his fiancee, Nora. When he’s gone his pals learn that an icebreaker is heading his way. Three of them go after him to warn him, one of them staying at the shore. The icebreaker comes and separates the other two and Roy from their shore and their friend. The third man detects their signals and gets the rest of the company to rescue them.