East London school teacher Kyra Hollis is visited on the same night by son Edward and father Tom Sargeant. Kyra had been living with the Sargeant family years earlier, but left after her affair with Tom was discovered by Tom's wife, who has since died. Edward now accuses Kyra of having left him as well, as he saw her as a big sister; and he demands to know why she left his life.
Shortly thereafter, Tom, a wealthy restaurateur, with real life references to Terence Conran, appears unheralded and for no apparent reason. Kyra's less than glamorous lifestyle leads him to poke fun at her to the point of insult, accusing her of self-punishment. After Kyra cooks a spaghetti dinner (which the actress actually cooks on stage), the talk turns to their relationship, and it becomes clear that their chances to be rekindled rest on whether one of them can change their preconceived notions of the other.