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.
The \"Stuck-Up\" twins are determined that they will not be snowed by the climate at St. Clares - but are proved wrong. They realise that they are at the finest school in England and soon shape up, after some good talking-to's, a midnight feast, and various hi-jinks.
'I think we ought to have a midnight feast every term, you know! School doesn't seem really complete without that!' The second form have plans to enjoy themselves. But will spiteful Elsie spoil the feast?
The Secret Seven are Peter and his sister Janet, Jack, Colin, George, Pam and Barbara. They meet every holiday in the shed at the bottom of Peter and Janet's garden - and solve mysteries, and eat lots of delicious food. But no one can enter the shed without whispering the secret password!