Luke, Connor, Thea, and Violet spend their first holiday together alone in their father’s house in France. The boys don’t really know him – he left their mother when she was still pregnant with Connor, getting together with the girls’ mother soon afterwards – and they don’t really know their half-sisters, either. Luke, the eldest and most easy going of the four, is keen to bring a new shape to their overlapping, unconventional family; Connor and Thea, born just six months apart but a world of difference between them, are attracted to each other, something they try not to acknowledge but which keeps pushing its way to the surface; Violet, the youngest, is trying to figure some things out about herself, and trying desperately to forget others.