Julian, Dick, Anne, George and Timmy the dog find excitement and adventure wherever they go in Enid Blyton's most popular series.

In book 19, the Famous Five travel to Demon's Rocks and discover a very old and valuable gold coin. Demon's Rocks is famous for its stories of bountiful treasure, but if the myth is reality, who does the treasure belong to?

The Five are determined to find out, but first they need to know who else is exploring Demon's Rocks for the treasure....