Jerry Nolan, a boxing champion, gives up the ring to work as an iron "rigger" by day and to study engineering at night. Jerry complains to "Bull" Kerry, his foreman on a skyscraper job, that many of the steel beams have been drilled incorrectly, and Kerry's disinterest provokes suspicion. Marion Wright, daughter of the contractor, is attracted to Jerry, who saves little Isadore Ginsberg from a beating at the hands of Kerry and takes him home to his Irish mother. Jerry saves Marion from injury in an accident at the construction site, winning the gratitude of Mr. Wright, who fires Kerry and gives his job to Jerry. The foreman retaliates by calling a strike, climaxing with Jerry and "Bull" Kerry in a clash on the steel girders; Kerry confesses his and Norcross' complicity, and the lovers are united in marriage.