Gangs of London offers up an engaging story that viewers will definitely have to pay attention to. Overall, the series explores the various underground crime groups in London that rake in billions of pounds. The show opens up with the murder of Finn Wallace, the top mob boss in London's crime scene. After Finn's death, his son Sean works closely with Ed Dumami, a family friend of the Wallaces and Finn's partner, in order to take on his father's position. With the help of Ed, Finn begins to learn how the entirety of London's crime scene works. However, taking over his dad's empire proves to be an arduous task that winds up putting a massive target on his back.
While Sean begins his rise to power, undercover cop Elliot Finch offers to help out. Interested in how London's underground criminal organizations work, Elliot promises to keep an eye on Sean while he explores this new scene. However, the more he uncovers, the more he realizes that London's crime scene is far bigger and more intricate than he could've ever imagined. With international ties and higher officials being involved in London's underbelly, Elliot and viewers alike will be shocked by his discoveries.