Tommy goes to London to meet the wildly eccentric and volatile Duke Leon and soon discovers the extreme lengths his new paymasters are willing to go to in their quest for power. In Birmingham a personal dispute with the Italians threatens to explode into a devastating war.

Responding to the Italians’ actions, Tommy is set on a path of deadly vengeance that could take him to his darkest place yet, and threatens to splinter the family. As Arthur struggles with his conscience, Linda implores him to stop his illicit work with the Peaky Blinders.