London descends into chaos after a contaminated cocaine shipment results in hundreds of deaths. This catastrophic event ignites brutal power struggles, unexpected alliances, and fierce rivalries among the city's criminal factions. Key players such as the Wallaces, Luan, Lale, and various street gangs face devastating consequences as personal vendettas intertwine with professional conflicts, leading to violent turf wars. Amidst this turmoil, Elliot Finch, formerly an undercover cop turned top-level criminal, navigates his new role alongside the Dumanis, striving to maintain control in the increasingly volatile underworld.