In their ramshackle Somerset home, with its lush gardens running down to the river, the Sorrells have gathered for a last-minute wedding--an occasion that is met with trepidation by each member of the family. Lucy, the bride, has begged her loved ones to attend--not telling them that she has some important news to share once they've gathered. Her prodigal baby sister, Margot, who left home after a devastating argument with their mother, reluctantly agrees, though their family home is the site of so much pain for her. Meanwhile, their eldest sister, Eve, has thrown herself into a tailspin planning the details of the wedding--anything to distract herself from how her own life is unraveling--and their long-separated artist parents are forced to play the roles of cheerful hosts through gritted teeth. As the Sorrells come together for a week of celebration and confrontation, their painful memories are revisited and their relationships stretched to the breaking point.