When Cassie Rosse becomes the first woman to train an English Derby winner with her home-bred horse 'The Nightingale, she knows that she shares this success with her dead love, Tyrone. For it was to his Irish family home of Claremore that he brought Cassie as a young bride, and it is from Claremore that Cassie has at last stormed home to win a place in the history books.
But life will never be simple for Cassie, a woman who stands alone in what is essentially a man's world. Unable to escape from the long shadows cast by the early death of her husband, yet torn between two extraordinary but very different men, Cassie's integrity and her indomitable will to win trigger a set of circumstances which quickly turn a brilliant triumph into a nightmare. Suddenly it seems that nothing can reverse the downward spiral of events surrounding her famous horse and its future and Cassie is forced to battle hard to keep Claremore, and with it her past with Tyrone and everything that makes her life worthwhile.
