Hari Puttar has recently moved from India to the U.K. with his parents. His father, Professor Dhoonda is assigned to work on a secret mission and has confidential information stored on a chip hidden at his house. His family leaves in a hurry for a vacation planned by his uncle DK and forgets to take Hari and his cousin Tuk Tuk along. An infamous Don, Kali Mirchi, assigns two burglars Diesel and Filter to steal the secret chip from Hari's house. Now begins an adventure with Hari out smarting their every move and eventually managing to capture them.