1932, Devon. Amory Ames is glamorous, wealthy and unhappily married to notoriously charming playboy Milo. She willingly accepts her former fiancé Gil Trent's plea for help in preventing his sister Emmeline from meeting a similar matrimonial fate. Amory accompanies Gil to The Brightwell, the sprawling seaside resort where Emmeline and her fiancé, the impeccably groomed, disreputable cad Rupert Howe are holidaying, along with the other rich and sumptuously-dressed guests.
Champagne flows but the sparkle soon fades as a dark and unresolved history between Gil and Rupert surfaces. After a late night quarrel the luxurious hotel is one guest fewer by morning. When Gil is arrested for murder Amory is determined to defend his innocence. But if she's right, the killer is still in their midst - can she prove it before she, too, becomes a victim? And what of the unexpected arrival of Milo? Extravagance, scoundrels and red-herrings abound as Amory draws closer to discovering the murderer - as well as love.