Recursion

Above 4 but not completely 5 because the beginning was a bit slow and I put the book down for a good while, and then binge-read it in the last 3 hours.

The last 100 pages were just hell over and over again, and so mesmerizing and agonizing to read. I loved the story and the execution. The endless iterations, the meetings, trusting someone enough to live through hell over and over again. The relationships in this book were a lot stronger as the plot revolved around them.

This was very different from Dark Matter and I enjoyed it immensely. Realistic science fiction done right.