Dhana 51 is a Love story Based Movie, Directed by Satyam fame Soorya Kiran.Dhana (Sumanth) is a dynamic graduate who mingles with his ex-college students. His lifetime ambition is to become a cop. He wants to become cop genuinely without giving any bribes. He befriends a beautiful girl Lakshmi (Saloni), who happens to be the daughter of honest and most powerful Police Commissioner Mahesh Chandra (Mukesh Khanna). Dhana and Lakshmi become best buddies over a period of time. Dhana gets fed up with bribery system in police selections and he decides to start a musical instruments shop to make a living.
Mahesh Chandra then convinces Dhana to act as undercover police agent to book dangerous goons in the city. Dhana pretends as rowdy and give leads of other rowdies to Mahesh Chandra. Mahesh Chandra's plan is to have open jail for all these goons and rehabilitate them as good citizens. Just when Dhana completes getting 50 rowdies to the book, Mahesh Chandra does the act of turning around. He books Dhana as 51st rowdy as an act of revenge for attracting his daughter. The rest of the story is all about how Dhana 51 proves himself innocent and get back to Lakshmi.