Dhruvam movie focuses on the powerful Mannadiyar family who are viewed as God by the community. Whenever a problem occurs to anyone, they would ring the bell located in mannadiyar's courtyard. Mannadiyars would only go to sleep after they found an answer to the problem. Narasimha Mannadiyar(Mammooty) is the head of the family and is kind of people's king who call him 'thampuran' as sign of respect. his brother Veerasimha Mannadiyar(Jayaram) is everything to him and always tries to fulfill his ambitions. Veerasimha's one such ambition is pursue his MBA career in England,to which Narasimha agrees. but while on the way to the airport, Veerasimha gets brutally murdered with his friend.
he rest of the film is how narasimha and his trusted associates Bhadran(vikram),priest-to-be turned police officer Jose Nariman(suresh gopi)and DIG marar(Janardanan) fight to bring feared serial killer Hyder(who is behind veerasimha's murder)to justice.