Balaji and Milan Luthria's Once Upon A Time In Mumbai is seen through the eyes of a police officer. It traces the changing face of the Mumbai underworld and how it all started.
The film, set primarily in 1970s Mumbai, follows the rise of Sultan (Ajay Devgn), and the conflict, when his prot?g? Shoaib (Emraan Hashmi), challenges his supremacy, and usurps power to rule the murky underbelly of Mumbai.
The film is presented in a retro chic style and is a glamorous and powerful rewind to the golden era.