Synopsis :
The morale at Mumbai Crime Branch is extremely low. All work is happening in a highly discretionary way.

Sr. Inspector Vikram Singh [Shatrughan Sinha] has given up on the system. Inspector Appa Naik [Suniel Shetty], the encounter specialist, is of the opinion that criminals need to be eliminated. Constable Khalid [Paresh Rawal] is a happy-go-lucky guy.

These officers have accepted a laidback attitude as a way of life as they know that no one can beat the system.

The city is virtually ruled by three people… Manik Rao [Manoj Joshi] -- the Home Minister calls the shots, with the law firmly under his control. Underworld don Yusuf Pathan [Irrfan Khan] has his full support. A business magnate, Gautam Walia [Jackie Shroff], is also hand-in-glove with them.

But everything changes when D.C.P. Hari Om Patnaik [Akshay Kumar] gets transferred from Pune.

The three officers find themselves at loggerheads with the new officer, who is determined to change things. The opportunity arises when Manik Rao gets businessman Ajit Pradhan [Milind Gunaji] eliminated by Yusuf Pathan's younger brother [Rahul Dev].

Pradhan's murder opens a Pandora's box. Hari and his men set off on a trail to nab the people behind this hi-profile murder. AAN may not be the most original script you've witnessed, but it does boast of several engaging moments.