Dana is autistic (very convincingly so), and school is pretty much hell. The only good thing is that she can talk to the classroom wLAN, the through it, the internet. Thngs get worse when she has to spend a nght in hospital, and the doctors find someting metal inside her skull, even though she has no scars. While she's still reeling from that, she wakes to "hear" a beacon whispering at her that she'll be safe if she can just reach the beacon. So she sets off and promptly gets kidnapped by a woman who claims to be her mother, and a famous scientist and a victim of the beacon builder, and Dana's only hope of safety. When Dana finally reaches the beacon and meets Pilgrennon, she gets totally different story, and she has no way of telling which one is true. While she's still trying to work out who to trust, somebody starts trying to kill her, and the adventure really starts.
One of the many things I liked about this book is the charcters. The main characters evolve as the story goes on, the autistic children are completely believable and even the villans think they're heroes. That makes you care much more about what happens.