Rosie, Daniel, and Serge met at Oxford in the early 2000s. Fifteen years later, they are guests at a lavish three-day wedding in Provence. They are also no longer on speaking terms. Rosie is dreading a weekend around her ex, Serge, and his fiancé Isla. Serge is hiding a crippling debt -- and a secret separation. Daniel, now a successful actor, is drinking to cope with life in the limelight. And Isla is wondering why motherhood looks so much easier for everyone else... As the champagne flows, historic rivalries and infatuations surface, and old and new secrets emerge. This is a wedding to be remembered, for all the wrong reasons