Two months after announcing Mumbai Saga, Sanjay Gupta is ready to kick off the shoot of the gangster drama featuring John Abraham and Emraan Hashmi, tomorrow. Though his 25-year career has been largely dominated by gangster thrillers, Gupta promises that the upcoming ensemble film — that also stars Jackie Shroff, Suniel Shetty and Prateik Babbar among others — is his "most ambitious" to date.

"I have been working on this film for more than four years. It's a human drama about cops and gangsters, with an emphasis on the events between the mid-'80s to the '90s. There's an explosive story about how the mills were shut down to make way for malls and high rises, thus changing the landscape of the city," he says, unwilling to reveal if the film focuses on any particular episode.