Despite improved treatment and knowledge of the virus, the incoming winter wave overwhelms Abbey and staff. The life of Ellie, a patient with multiple sclerosis and Covid-19, hangs in the balance when ventilators are desperately scarce. The Christmas aftermath comes on hard, especially for Emma, now a junior doctor, struggling under immense pressure. Covid deniers surface, causing staff morale to plummet. Patients are denied emergency operations due to lack of ITU beds leading to a moving emotional finale as Abbey makes a final stand and the team are given a chance to come together through their trauma..