A 17-year-old arrives after falling from his bike and suffering a fit. Consultant Liz needs to find out if a broken neck is the cause of his arm numbness. In the hub, Sister Jane is struggling to manage the high volume of patients, not just those arriving by ambulance, but walk-ins too. One such walk-in is Johnathan, a 41-year-old recovering addict, who has infected ulcers on both legs.