This was a really quick read but it's one of those books that leave you thinking about it long after you finish it. It definitely should be read during one sitting and is short enough that it's possible to finish in an hour or so, and this is coming from someone who isn't a fast reader. 
 There's a sense of dread once you start to read and that feeling follows through all the way to the end. You'll find yourself jumping to conclusions and trying to figure out what is going to happen as you read. The ending is a bit ambiguous which always drives me crazy but I do recommend this book. 
 There were similarities between this book and I'm Thinking of Ending Things by Iain Reid, not so much with the plot but with the emotions you'll experience as you read.