Lady Noreen of Kildoran's father is killed during a fox hunt, and his daughter is left with the debts of the estate and a dilapidated castle. Ephraim Roach, who holds a mortgage on the property, threatens to foreclose unless Noreen marries his son, Desmond; but she rents the castle and the servants to a wealthy young American, Terrence O'Brien, pretending she is only a housemaid. O'Brien sees through her acting and helps to repair the estate. The arrival of his fiancee, Leila, and her brother, Osborne, leads Noreen to make life uncomfortable for Leila and to break up the engagement. Roach comes to foreclose the mortgage but is thrown out by O'Brien, who announces he has taken over the estate and that Noreen is to be his wife.