After 26 years of marriage Lily and Charlie separate. Lily moving on with her new fiance Joe, and Charlie, with his new, younger, girlfriend Chloe. Even Lily and Charlie's grown-up children Polly and Thomas have come to terms with their parent's new lives. But when Lily's mother dies, Lily and Charlie decide to get the family together for one last weekend in the old family summer home - a weekend that just happens to be their thirtieth wedding anniversary. As the whole family gathers with their respective partners, home truths come out and secrets are divulged. By the end of the weekend, everything will have changed - but for better or for worse?