Department S - Season 1 Episode 3 A Cellar Full of Silence

LOCATION: London, England DATE: June 20th Four men dressed in various costumes are gunned down in a cellar. The gun of one had been fired, the bullet turning up in the body of a man found in the trunk of a submerged car. Stewart pays a call on a crime broker to see who hired the men and how the crimes relate to a house in St. John's Woods, where a woman is being kept sedated because she thought she saw four men wearing disguises committing a robbery in the house.