Malloy, a young Irish construction engineer just out of college, is assigned to a project and immediately falls in love with the contractor's daughter, Eileen. The contractor's secretary, who also loves the girl, hires Oleson, a Swede, to work with Malloy and delay the building sufficiently to arouse the ire of the contractor. Under these conditions, however, Malloy works all the harder, never looking gloomy or restraining his Irish humor until the Swede comes to blows with him over a strike.