A very well done novel from Blake Crouch! Dark Matter explores the idea of alternate realities in a believable and well-thought out way. It's obvious that Crouch really took his time when creating this world and wanted to make sure he covered his bases when explaining the rules and limitations of traveling through different realities. Tackling subjects like this - alternate realities, time traveling, etc - can be tricky. The author has to be mindful of loopholes and contradictions when he introduces new possibilities. Crouch did this very well, and as I was reading, I never found myself questioning this world or the logic behind it. I accepted it as truth. 
 Another thing I LOVED is that everything that I wanted to happen in this story, happened. And it all happened when I wanted it to happen. This may be the first time I have felt so satisfied by the outcome of a book. I'm sure we can all relate to the experience of reading a story and wanting the plot to speed up because things are not unfolding fast enough. Or wanting it to slow down because we feel like big, important moments are being rushed through and not explored to their fullest potential. I know it happens to me a lot. This wasn't the case with Dark Matter. 
 Our main character had just the right amount of longing for his family. Just the right amount of hope as well as hopelessness. Just the right amount of confusion and uneasiness as well as perseverance and problem solving. As soon as I wanted a new element to be introduced to the story, it was introduced. (view spoiler)[As soon as I wanted our MC to make it back home, he made it back. As soon as he reconnected with his wife AND his wife accepting him, it happened exactly as I wanted. (hide spoiler)] Nothing was dragged out, and nothing was glossed over. Satisfaction... I really can't think of a better word. 
 Moral of the review, I really enjoyed this. I read the whole book in one day, and I recommend it to anyone who likes science fiction novels. A very interesting plot executed with great skill by a fantastic writer.