1815. Having fallen on hard times, doctor's daughter Grace Ellis serves as a lady's companion. But on Lady Florence's death, Grace discovers that she's been left an unexpected legacy by her former mistress. There's just one catch. In order to claim her inheritance, Grace must wed Lady Florence's disreputable nephew, a gruff army brigadier more than three times her age.

She is offered a way out by family friend Dominic LeSayres, who determines to marry Grace himself in order to save her from a grim fate. But just as the proposed marriage of convenience looks set to turn into a true love match, others step in to crush Grace's happiness ...