The Famous Five (1978)

S2E10 Five Go to Demon's Rocks (1)

The Famous Five have always been intrigued by the legends surrounding treasure on Demon's Rocks, but they never imagined it was actually real. Their belief shifts when they stumble upon an ancient, valuable gold coin, turning myth into reality. Curious about the treasure's rightful owner, the group is eager to investigate further. However, they soon realize they aren't the only ones searching Demon's Rocks for the hidden riches, and they must uncover who else is on the hunt before they can delve deeper into the mystery.