"Darkening Skies" is the 18th book the Left Behind: The Kids series. It's release date was in October of 2001. It was written by Tim LaHaye and Jerry B. Jenkins.
Book Synopsis
Synopsis retrieved from back of the book.
With nowhere to turn, Judd and Lionel must trust the son of a Global Community officer to lead them to safety. Fearful that Melinda will turn them in, Vicki and the rest of the Young Trib Force begin a frantic search for her. As another judgement rocks the planet, the kids wonder whether Judd and Lionel will ever make it home.