This was going to be three stars, but by the time I got to the end of the book, it was a four. Goodreads Summary: Kirra Hayward is an ordinary sixteen year old – smarter than most, but otherwise completely anonymous. When she stumbles across an unusual puzzle on the internet and manages to solve it, she has no idea of what she’s letting herself in for. Kidnapped by a shadowy organisation known only as The Industry, Kirra soon discovers how valuable her code-breaking skills are. And when she stubbornly refuses to help them, they decide to break her … by any means at their disposal. Kirra knows that to protect herself, she must trust no one, not even her fellow prisoner, Milo. But…