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 . . .

Enid Blyton, who died in 1968, is one of the most popular and prolific children�s authors of all time. She wrote over seven hundred books, which have been translated into many languages throughout the world. She also found time to write numerous songs, poems, and plays, and ran magazines and clubs.