Billy, Nicola and Mr Gopal are off to India in a flying boat to solve a baffling mystery! The gum that comes from the wonderful bubblegum trees that grow in the Indian jungle has not been delivered for two months. Without this secret ingredient, there`ll be no more Gopal`s Best Pink Bubblegum, and even more importantly, no more Bubblegummies - the people who live in the trees and harvest the gum. It`s not an easy mystery to solve - and soon the friends are involved in a bungee-jumping, tiger-trouncing, woodcutter-walloping, bubblegum-blowing adventure!