This book was absolutely gripping and incredibly well done. I was hooked on the idea that every character, including the narrator Theo, was hiding something. And it was only a matter of time before everything unravels as they find out each other's secrets. I'm a sucker for a murder mystery set in a remote, wintry cabin where no one can leave and Marshall sets this up perfectly! The writing was sharp and clever. I often found myself confidently guessing the characters' secrets more than once, only to be proven wrong each time, which made the twists even more enjoyable.