Laddertop, Volume 1

Laddertop, Volume 1 - Orson Scott Card, Emily Janice Card, Honoel A. Ibardolaza Aliens came to earth and built four (I think) elevators up to space. Children are recruited each year to attend Laddertop Academy. It's very prestigious and not everyone gets to go to outer space. However, rumor has it that the children who attend Laddertop are called web rats and have to crawl around a series of pipes that are too narrow for adults to fit in. Adults are trying to figure out the alien's plans and somehow this involves the pipes.This was only volume 1 so we haven't gotten a lot of answers yet but I am definitely interested in where this is going. I am not really sure what is going on with the pipes at this point so I'm looking forward to volume 2.