Stray by Andrea K Höst
Don't let the cover of this book fool you. While it looks just like a girl-going-hiking novel, this book is actually super science fiction! As Cassandra Devlin is on her way home from school one day, she suddenly finds herself in a massive forest like nowhere on the planet Earth. Cass finds herself rescued by strangers with incredible technology from a world where no one has heard of Earth. Can she adjust and learn to love nanotechnology that permeates every aspect of her rescuers' lives? Will she turn out to have psychic powers like so many "Strays" found before her? And will she ever see her home and family again?
Packed with amazing gadgets, cool characters with psychic powers and uniforms as styling as the ones in the "Hunger Games," "Stray" is a great bet for a science fiction fan who is looking for the next big thing. Best of all, it's the first in a series!
You don't have to take my word for it; here are some other reviewers who loved "Stray!"