The series, created by “Mistresses” writer Richard Warlow, features a dynamic cast starring Matthew Macfadyen (“MI-5,” “Pride and Prejudice”), Jerome Flynn (“Game of Thrones”), Adam Rothenberg (“Alcatraz”), Myanna Buring (“The Twilight Saga,” “White Heat”) and David Dawson (“Luther,” “Secret Diary of a Call Girl”). The action centers on the notorious H Division, which is charged with keeping order in the all-consuming chaotic East London streets.