The Valley of Adventure (Book Three of the Adventure Series)

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? Who are the two strange pilots, and what is the secret treasure hidden in the lonely valley where the children land? Nothing could be more exciting than a daring night flight on Bill's plane! But Philip, Dinah, Lucy-Ann and Jack soon find themselves flying straight into a truly amazing adventure Dinah, Philip, Jack and Lucy-Ann get on the wrong plane at an airport, and are embarked on another adventure, in a deserted valley surrounded by high mountains, where the men from the plane seem to be hunting a treasure. Philip, Dinah, Lucy-Ann, and Jack take a night flight on Bill's plane and end up in a valley with two strange pilots instead of Bill and a treasure to search for