Five Go to Demon's Rocks (1) - S2.E10

The Famous Five have heard the stories about treasure on Demon's Rocks - but they never thought they were really true! But then they discover a very old and valuable gold coin and what was a myth becomes real! Who does the treasure belong to? The gang are determined to find out, but first they need to know who else is exploring Demon's Rocks for the Treasure - just like they are ...