As the name suggests, this is fun filled caper about four friends – Roy (Riteish Deshmukh), who belives that he is the best detective in the world; Manav (Javed Jaffery), who actually happens to be the biggest idiot in the world, but is blissfully unaware about it and his elder brother. Aditya aka Adi (Arshad Warsi), whose encyclopaediac half knowledge about everything only adds to the great expertise of this group; the final component of which is Mr Scared of everything, Boman (Ashish Choudhary). These four lovable idiots live and work together. Their idea of work? Doing small time can jobs! The thought of earning an honest living has never even crossed their minds. One day, while trying to save a dying man. Bose (Prem Chopra), they get their big break. Their life is made! Unfortunately for them Police Inspector, Kabir Nayak (Sanjay Dutt) has been chasing Bose for the last ten years. He finally finds him. Only dead! Desperate for his promotion, he questions the suspicious looking foursome he finds next to the body. Inadvertently they blurt out the secret before managing to escape. Now begins the mother of all chases! As one misadventure follows after another, the five are thrown into hilarious situations that has the audience in splits and quessing. Big Action. Big Fun, Dhamaal!