This book is a little too realistic. Set in a world where algorithms know everything about us, including mining dreams for data from a device marketed to help people sleep. A stressful life situation could manifest in an upsetting dream that lands you into a detention center "for observation." It's not a prison, but has plenty of similarities. Words and explanations mean nothing--the data doesn't lie. Sara is a sympathetic character, and I was really invested in her story, hoping she would be able to be released but also not seeing how it could be possible, with the way the center worked, where every tiny infraction incurs more time, the bureaucracy of the hearings, and of course the dream data that is never ending.