Ohhhh that was great!! Maybe not as surprising as Dark Matter, but nonetheless a very well written time travel/parallel universe book. It had good characters (they might have been a bit better), very good pace, solid science-fiction element very well masterize and a solid plot. Everything was good, but what did it for me, like always with this tropes, was the thinking and philosophical reflexion about time, reality and how we perceive it. If you love Dark Matter and/or time travel you should definitely read this one!