It's the summer vacation. Pikoo and Mon are with their grandparents in Visakhapatnam. On the beach, they chance upon a bottle carrying a mysterious message! Soon, smugglers, kidnappers, and gangsters are after them. In answer to their questions, their brigadier Grandpa begins telling them about KOYEMSAN and the Andamans and how he became a friend for the good and a nemesis for the bad and the evil.