Manu Uncle

Manu Uncle is a 1988 Malayalam childrens film written and directed by Dennis Joseph starring Mammootty in title role. The film is regarded as one of the best childrens film in Malayalam cinema and it won a National Award and a Kerala State Film Award.citation needed

The children happened to visit the Art Museum on the very same time when the Marthandavarmas crown was stolen. Ikru noticed the robbers, Gomas, Appu and Kittu but was not able to describe them to his grandpa. Manu who has a well equipped communication system once happened to hear a conversation between Kittu and Gomas planning to loot Marthandavarmass sword. Manu and his father rush to the palace. Gomas meanwhile already gets hold of the sword when he encounters Manu and his dad. A fight follows in which Manu is injured by Gomas so now Manus father follows the robbers alone. But the robbers kill the police officer in a planned lorry accident. The viewers are just now able to know who the mastermind behind the robbery is Ravunni, the family friend.Unfortunately for him though, the incident was witnessed by Khader, a young orphan who was happened to be in that lorry. The robbers see the boy and go after him. The boy manages to escape from them and in the process ends up meeting the four children, and tell them that their grandpa was not dead in an accident but was killed. ........

Source: Wikipedia