Two thrilling adventures in one volume, from one of the world's most famous authors - now with a stunning retro look to appeal to a new generation of readers.Nothing could be more exciting than a night flight on Bill's plane. But in THE VALLEY OF ADVENTURE, Philip, Dinah, Lucy-Ann, Jack and Kiki the parrot fly straight into terrible danger. In THE SEA OF ADVENTURE, the children find themselves marooned on a desolate coast, playing a dangerous game of hide-and-seek with an unknown enemy.