Cornwall, 1929. Fiona Fox, youngest child of the celebrated Fox family, is a devoted volunteer at the local lifeboat station, giving all her free time and her energy to the selfless crew. But when she seizes a once-in-a-lifetime opportunity to do more, she sets in motion a chain of events that sparks danger and intrigue at Fox Bay Hotel. The stranger she brings into her family home provides an unsettling presence over Christmas, and when visiting 'Hollywood Royalty' is drawn into the web, Fiona has to decide how much her promises are worth after all. But the glamorous visitors have their own secrets, and their own reasons for hiding out at Fox Bay. As those reasons become apparent, Fiona must choose between betraying a close friend, and keeping her word... And lives are at stake whichever way she turns.