Incredible book, another cracker by Andy Weir. An example of what would happen if the human race faced an extinction level event, the tough choices that need to be made and our ability to make connections to overcoming insurmountable obstacles. Its emotional, humorous, told within two timelines, its never far from reality, grounded in science, but set among the stars. Similar to 'The Martian', you feel every part of the journey through Grace's eyes, fully invested in his character arc and emotions right to the end. As a big sci-fi fan , this book is a personal favourite.