Laddertop

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. It's up to these brilliant children to work together, using their special gifts and the unique bonds they share, to find a way to stop the end of the world before it's too late.

Basic training is over. For eleven-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. Meanwhile, her best friend Azure goes from Laddertop reject to a recruit for a secret research mission, led by a group of rebels who don't trust that the Givers mean no harm. Though on different paths, the two friends' destinies soon collide, as they decipher an alien message and solve an ancient mystery that could either save the Earth from invasion … or trigger its imminent destruction.