Tommy (Aneurin Barnard) and Joanne (Amy Shiels), who is pregnant, live in a dilapidated apartment complex. One day, when Tommy is in an elevator, Joanne is cornered by a group of teenagers, all wearing hoodies. Tommy watches helplessly as the gang attack his wife, desperately trying to exit the elevator. He finds her beaten, with a syringe in her stomach. In a flashback at the hospital, Joanne survives and gives birth to Elsa (Harry Saunders), a healthy girl. However, Joanne remains in a coma for several months, eventually being taken off life support. Grief-stricken, Tommy is consoled by a friendly nurse, Marie (Wunmi Mosaku), who attempts to help him with his agoraphobia, the result of his traumatic experience.