The Laddertop Series

Twenty five years ago, the alien Givers came to Earth and bestowed upon the human race the greatest technology ever seen—four giant towers known as Ladders that rise 36,000 miles and culminate in space stations that power the entire planet. Then, for reasons unknown, the Givers disappeared.

Basic training is over. For 11-year-old Robbi, the real work on the Laddertop station begins…even as its strange, dark secrets grow more compelling. With the help of mentally linked robot companions, she and an elite crew of children perform the dangerous maintenance work on the Power Web. But only Robbi keeps having urgent dreams from The Givers, the alien species who bestowed upon humans all the Laddertop technology. 

All seems lost as a giant comet hurtles toward Earth, while Robbi’s Laddertop is thrown into chaos by the unleashing of Energy Spiders that now prowl the Power Web. As Robbi races against time to save the Laddertop and reveal its final secret, Azure and the rest of her research team discover the horrible truth about the comet and the existence of a different, malevolent group of aliens: The Takers.