Thank you to BookSirens for this ARC - and this author is quickly becoming one of my absolute favourites. Gosh darn it, this book kept me feeling so tense! It was even better - and scarier - than the last book I read by this author. It was creepy and uncomfortable and as a reader, I just felt so desperate for the resolution: it was really compelling. I absolutely adored Wren and I found the other characters quite intriguing. As one other reviewer commented, I wish there had been an elaboration on the technophobia, but otherwise, this book was brilliant.