In Sydenham, south London, 17-year-old Levi Ernest-Morrison is stabbed outside his house. His mother Bonnie races to his aid, but he dies in her arms. Detectives from the Murder Investigation Team must track down those responsible.In Harrow, north west London, a young woman has gone to police and alleged that she has been threatened with violence and forced into sex work. Her case is investigated by the Met's Modern Slavery Team.In Lambeth, south London, response officers Wes and Martha police the streets, while public confidence in the Met is at a record low. They respond to a call that schoolboys have been seen throwing fireworks, and that a man has been seen with a knife in a fast food restaurant.