London, 1817. The Marquess of Tannerton has whatever he needs, but what he truly desires is the company of Rose O'Keefe, the Irish singer who's been captivating hearts at Vauxhall Gardens. While Tannerton's secretary, Flynn, may be proper enough to keep his own interest in the lady from disrupting his employment, the foreboding Lord Greythorne appears to take whatever—and whomever—he wants, whether by money or force. All Rose wishes to do is sing for Flynn, but she may end up using her beautiful voice to cry for his help.