On the way to a visit of their uncle in Thailand, Fatty bumps into a young girl named Baiyer. Daughter of a famous anthropologist, Baiyer has in secret possession a golden necklace on which is engraved the map of an ancient treasure by her father. Having witnessed the murder of her father by Scorpio. They befriend with each other and return to Bangkok.

Scorpio kidnaps the kid's uncle. Fortunately, with the help of Black Skin, they finally succeed to rescue Uncle.

On the way to where the treasure is buried, they are received by the orphanage in which Baiyer once stayed. The orphanage if facing the fare of being closed down because of a lack of funding.

After much hardship and adventures, they dig out the treasure. But Scorpio and the gang have also arrived. The 2 parties have a duel and the latter are beaten by the kids. Baiyer donates the treasure to the orphanage.