The five friends on vacation on an exotic island while diving in a shipwreck exploring around they found a mysterious compass, which is the indication of a pirate treasure, according to the local girl Joe. They find out that the Investor Mr. Haynes has plans to build a resort in the bay. Joes family would sold by these plans from the bay, and so they decide to look for the pirate treasure to save her home and her family.—Dimitris Kamitsis

In an old shipwreck the Famous Five discover a mysterious brass locket. The local girl JOE believes, that this is the key to a lost pirate treasure. Joe confesses, that an investor wants to banish her tribe from their bay, to build a tourist resort instead. This treasure is her last chance to save her home. Together the kids embark on a treasure hunt through the dangerous jungle. But a gangster couple is on their tail. The kids manage to shake off their pursuers, when Julian collapses! He's been bitten by a highly poisonous insect. Joe knows of an antidote which grows on a remote mountaintop. Now time is of the essence: Not only is Joe's home at stake, but Julian's life...

Coming along as uncle Quentin's firm is contracted for a development project by tycoon Haynes on a tropical (fictitious SE Asian) island , Julian, Dick and Timmy are eager to turn their beach holiday into an adventure. Accidentally diving up a brass locket, a clue, they dream of discovering a pirate treasure, buried in the jungle. It's mentioned in legend, known to fresh local girl 'Joe', who eagerly tags along, hoping to earn enough to redeem her broke village facing expropriation. But the western couple who run the tourist beach bar get wind of the project and are determined to steal the treasure. Julian soldiered on bitten by an insect, but the poison makes him collapse, in urgent need of rare antidote only growing on the mountain top. It's a dangerous there, to the treasure and back to the resort, where more nasty surprises await.—KGF Vissers