When the school summer trip to Blackpool gets cancelled, Harry's parents offer to include Harry's friends in their trip to Tredock Cove in Cornwall. Amelia, Mitch and Asad are grateful - Cornwall will be great and, even if it isn't as great as Blackpool, anything is better than being stuck at home, right? Ryan is less convinced. He's not the most open-minded of boys and he sincerely believes that Cornwall is full of carrot-crunchers. But he goes along anyway, even if it is reluctantly. Even Ryan doesn't want to be left at home by himself.
And it doesn't take long for the quiet break in Cornwall to turn into something much more exciting - and frightening. The kids find a secret code and become convinced that cracking it will lead them to hidden treasure.
As our heroes search for treasure, they find themselves pitted against these ancient forces. And they will need some extraterrestrial help if they ever hope to defeat them.
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