In their third cinema adventure the Famous Five are searching for a pirate treasure...
The film recounts the adventures of Julian, Dick, Anne, George and Timmy the dog on their first holiday together at the seaside. In an old smugglers' cave, the children happen to overhear a radio message that refers to the abduction of George’s father Quentin. The professor has set up a laboratory on Kirrin Island where he’s doing research on a new energy generation method. Someone has obviously taken great interest in the valuable research results. But neither the police nor George’s mother Fanny believe the children. They are now on their own and discover a conspiracy that almost takes their breath away.
For their bicycle tour to Catmoor, the friends Julian, Dick and Anne, their cousin Georgina, called George, and her dog Timmy have long looked forward to. But the camping holiday in the countryside ends with the kidnapping of Dick, confuse the two underprivileged hoodlums with the same age millionaire's son Hardy. With sophistication and courage, the five friends take on his trail that leads from a mysterious traveling circus to the castle "Owls Nest" where the kidnappers force Dick to coax the clue to a giant emerald.
