Gripping, yet easy to figure out. 
 A lot of people have compared this book to Gone Girl , The Girl on the Train , and even the book jacket speaks comparatively to Agatha Christie's works. I can see where they're coming from, but it's a bit far-fetched for each comparison. Yeah, there's a lot of twist and turns, red herrings, and some thrills. But they were a bit weak for me. 
 The Good Stuff 
 The premise is interesting. I, for one, would not want to get caught up in a situation such as this one out in the middle of the freezing ocean. Not a good time, I'd say. I liked the setting, or that is to say, I liked the extravagant ship and its passengers. There was a lot of mystery in the first half of the book that excited me. What the heck actually happened? She's seeing and hearing things but it doesn't seem at all plausible! And the narrator herself is amusingly unreliable. It really sets you up for a good ride...and then comes the 
 Not-So-Good Stuff 
 It plateaued. Fast and hard halfway through. The narrator becomes annoying with her round and round thoughts. The answer is hinted at too quickly. The other passengers start becoming less and less interesting and are left unused. And then we have to sit and wait for the narrator to figure out what we already know for the rest of the book. I was also expecting some answers for an event that happened before the entire mystery. I was disappointed and came away thinking that maybe the author just forgot about it? 
 I just feel like we were left too much to the narrator's thoughts half the time, and we didn't get enough out of the other characters. I feel like if those others had been used more, then maybe I wouldn't have been half as bored. The narrator just tended to go on and on with the same three thoughts, over and over again. To the point where I was tempted to just jump ahead to the last few chapters to see if my theories were right. And they were. 
 Overall, I felt like I had read this book before, but in a better way. 
 I don't really have much more to say, except that I think I really, really wanted to like this book. I did, but not to the extent that I was hoping.