Keiko and Kenzo love exploring nature with the latest and greatest tools. This summer vacation their father has flown them to their grandparents’ house in Malaysia, where they encounter many different types of wild exotic animals and plants in the Sarawak forest. Mr. Kimura, Keiko and Kenzo’s father, has designed a unique, high-tech device that helps the children discover even more information about the forest and her secrets. When their grandfather's phone mysteriously disappears from the car, leaving a strong, stinky smell, the children are determined to hunt down the thief with the newly invented "Sniffanalyser", but misfortune strikes. What will happen to them? Share their adventures in the book.