In Ireland, Jerry Kelly (George Murphy) marries his sweetheart, Nellie Noonan (Judy Garland) over the objections of her ne'er-do-well father, Michael Noonan (Charles Winninger), who swears never to speak to Jerry again, even though he reluctantly accompanies the newlyweds to America, where Jerry becomes a policeman, and all three become citizens. Michael continues to hold his grudge against Jerry, even when Nellie dies while giving birth to little Nellie.