The Randwick family is as noble as any but lives in greatly reduced circumstances. When Loel Woodbine, Duke of Marche and heir to three fortunes, makes an offer for Miss Valeria Randwick's hand, it seems like a godsend, but the young lady has already promised her heart to another—and a commoner, at that. Desperate to avoid the marriage, Valeria concocts a wild scheme that depends upon the good graces of her monastery-raised brother, Valentine. When the prospective groom sees through the ruse, he surprises Valentine by agreeing to cooperate. But can Marche and Valentine fool London society while dealing with an accusation of murder and the distracting fascination between them?