(Book #4) And they’re off! Dave Dashaway and Hiram Dobbs are on their way on a race around the world, and he has a secret mission to complete on the way. The They fly the Comet across the United States and Canada, stalked by wolves in Siberia, and looking for the secret city of Lhasa. And even after all of that, there is still one more surprise to be found on an isolated island.