In late-Victorian London, Mackie Messer ("Mack the Knife") is a gang boss whose lover is Jenny, a whore in a brothel on Turnmill Street (Turnbridge in the film). On first seeing Polly Peachum, however, he persuades her to marry him. His gang steals the props needed for the wedding, which is attended by Tiger Brown, Mackie's old comrade-in-arms in India who is now Chief of Police and about to oversee a procession through the city by the queen.