Ida is a forty-year-old architect, single and starting to panic. All she sees are other people's children, everywhere. Stuck at a gathering to mark her mother's birthday, Ida is regressing. She's fighting with her younger sister and flirting with her sister's husband. When some news heightens tensions further, Ida is forced to mark out new milestones of her own. For anyone who feels almost - but not quite - grown up.