You guys, this book is pretty fucking awesome. Think early Dean Koontz merged with Gillian Flynn's writing. Yes, I hated Gone Girl, but I love the way Flynn writes. I simply don't care about her plots.
Anyfuck! This book is amazeballs. It has your typical treasure-hunt-to-keep-a-kidnapped-someone-alive plot, but Pettersson is managing to make it her own. I've been shocked numerous times.
Think movies like Breakdown, The Vanishing, and 13: Game of Death. If you haven't seen any of those, remedy that shit posthaste.