London is the capital of the world. The city is dependent on its multinational views. Every street is patrolled not by law enforcement agencies, but by different criminal gangs. In "Gangs of London," the gangster world is shaken up after the sudden murder of Finn Wallace, who controlled the underground universe with his unwavering power for 20 years. His son, Sean, teams up with the Duna family and presumed ally Elliot Finch to uncover the truth about his father's murder.