1930. Deauville, France. Two newly-married couples occupy adjoining honeymoon suites in the same hotel. As a distant orchestra plays, Sibyl gazes adoringly at charismatic husband Elyot, while Victor admires his new wife, the vivacious and sophisticated Amanda.
Champagne flows and the sea shimmers in the moonlight as the newlyweds prepare for the evening ahead. But when Amanda overhears a familiar voice singing a forgotten song, an old spark re-ignites, with spectacular consequences.