The Bequest (A Regency Romance) by Jean Luntz
Joseph Harwood and his cousin Claude Defrose have seven days to meet the criteria of Uncle Edgar’s will. Harwood must marry; Defrose must prevent it. Whoever fails faces financial ruin, social ostracism, and even death. They do not consider that Claude will fall in love with Rebecca, the woman Harwood has chosen because Gwen is out of his reach. In the shadows, another works diligently, manipulating events to gain ownership of both estate and fortune. Wo will win when the time runs out.