Birmingham, 1919. The Shelby family lead the Peaky Blinders - a feared gang named for their practice of sewing razor blades into the peaks of their caps. Until now the Peaky Blinders have made money from illegal bookmaking, protection and the black market. But when a crate of guns goes missing from the local arms factory, Thomas Shelby (Murphy) recognises an opportunity to move up in the world.
As rival gangs, Communist revolutionaries and IRA Fenians descend on Small Heath in pursuit of the weapons, Winston Churchill dispatches a ruthless police chief from Belfast (Neill) to impose order on an increasingly lawless city.