Episode Description: Beware, spoilers! To read - hover over the text.
The new head of Bella sends it to the oil factory, where he finds the corpse of a son of a major mobster in the city. It became clear that de Silva, boss bell, long associated with the mafia and tried to break up with them. He was trying to start a new clan war that killed one of the leaders of a mafia clan. In finding that helped Sherlock. Bell helped him in this. As a result bell is back to captain Gregson.