Joan (Lesley Manville) and Tom (Liam Neeson) have been married for many years. There is an ease to their relationship which only comes from spending a life time together and a depth of love which expresses itself through tenderness and humour in equal part.

When Joan is unexpectedly diagnosed with breast cancer, the course of her treatment shines a light on their relationship as they are faced with the challenges that lie ahead and the prospect of what might happen if something were to happen to Joan.