I absolutely adore this one. The way this book just combines being funny and serious, the need for all the scientific knowledge and explains it but not in a “speak English, please” way. We unravel the backstory and find a solution for the problem in such a great way, in a way that neither side of the story (the past and the present) give a “c'mon let's go back (to one of the time)” feeling. I like that we don't know certain things, not until the end or even at the end, it's a perfect example of first-person narration. The mix between the past and present tense narration is also very nicely done. Perfect way to showcase that you can mix those, just not REALLY together. I love how the book basically from the beginning shows us that the stakes are high and it sticks with it until the end. Just showing it in different ways – like some characters' various sacrifices or stuff like that. Little things mixed in a dialogue or small actions. Also, Grace's character is a very interesting one, because everything he does sticks to everything that people say about him and how he is perceived. He doesn't really go through some big character development. And he is, obviously, not just one layer character. I love all the small and not small... Plottwists? Some of them are not really plottwists, just the ways to play with the situation, but yes. And even the last 30 pages are just such a rollercoaster. Love it. The ending is very heartwarming in a way.