A beautiful 70th anniversary edition of the first book in Enid Blyton's classic Adventure series, gloriously illustrated with the original line drawings by Stuart Tresilian, now in full color, and with a foreword by Cressida Cowell

For Philip, Dinah, Lucy-Ann, Jack, and Kiki the parrot, the summer holidays in Cornwall are everything they'd hoped for, until they begin to realize that something very sinister is taking place on the mysterious Isle of Gloom—where a dangerous adventure awaits them in the abandoned copper mines and secret tunnels beneath the sea.

Enid Blyton, who died in 1968, is one of the most popular and prolific children's authors of all time. She wrote more than 700 books, which have been translated into many languages throughout the world. Stuart Tresilian illustrated The Jungle Book and many other books that have come to be regarded as classics. Cressida Cowell is the bestselling author of numerous children's books, including How to Be a Pirate, How to Speak Dragonese, and How to Train Your Dragon.