Lady Oonagh is an evil woman who places Lord Colum under a spell that convinces him to marry her. Lady Oonagh uses the weaknesses of those around her to bring evil and unhappiness to Sevenwaters. When Conor and his siblings try to ask the Fair Folk to stop her, lady Oonagh places a curse on the brothers that turns them into swans. Only Sorcha can reverse the curse, therefore lady Oonagh does all she can to find Sorcha. Fortunately, despite many sacrifices, Sorcha manages to reverse the curse and return order to Sevenwaters.