Enid Blyton's much-loved classic series, packed full of adventure and mystery. Philip, Dinah, Lucy-Ann and Jack escape their tutor for a lovely holiday in Cornwall, right by the sea. They can see the sinister Isle of Gloom from their window, covered in mist and harbouring strange secrets. Are they prepared for the dangerous adventure that awaits them there? First published in 1944, this edition contains the original text and is unillustrated.