Three young men from different walks of life are brought in to the A&E department of St George's Hospital in London, including 17-year-old Shea, who has serious stab wounds and is sent to a high dependency unit. Fellow 17-year-old Bob arrives after impaling his leg on a fence while taking a shortcut home from his boys' school, and 33-year-old James is brought in by ambulance after fainting at home