A river cruise through ancient desert lands will be an adventure in itself, think Philip, Dinah, Lucy-Ann and Jack. An adventure it certainly is, especially when Bill disappears and the children, along with Kiki the parrot, are trapped beneath a forgotten temple where no one has set foot for 7,000 years.
Why on earth did Bill have to bring the wimpish Gustavus with them on holiday? Neither Jack nor Kiki the parrot like the boy at all. But when Gustavus is kidnapped, along with Philip, Dinah, and Lucy-Ann, Jack must bravely follow them to a faraway country and unravel a plot to kill the king.
Mrs Mannering thinks that a peaceful holiday in the Welsh mountains couldn't possibly land the children in another dangerous adventure. How wrong she is! Philip, Dinah, Lucy-Ann and Jack are soon up to their necks in the mystery of a rumbling mountain, roaming wolves, and a mad genious who plans to rule the world.
When Bill takes Philip, Dinah, Lucy-Ann and Jack on a mysterious trip to the desolate northern isles, everything looks sets for an exciting time. But then Bill is kidnapped and the children, marooned far from the mainland, find themselves playing a dangerous game of hide-and-seek with an unknown enemy.
Nothing could be more exciting than a night flight on Bill's plane! But Philip, Dinah, Lucy-Ann and Jack soon find themselves flying straight into a truly amazing adventure. What has happened to Bill? Who are the two strange pilots, and what is the secret treasure hidden in the lonely valley where the children land?
