A gangster family epic set in 1919 Birmingham, England and centered on a gang who sew razor blades in the peaks of their caps, and their fierce boss Tommy Shelby, who means to move up in the world.

Sherlock Holmes and Dr. Watson are called in to unravel a mysterious curse that has plagued the Baskerville family for generations. When Sir Charles Baskerville is found dead, his heir, Sir Henry, begs Holmes to save him from the terrifying supernatural hound that has brought fear and death to his household.