The author, Chris Hadfield, has flown on the Space Shuttle, and on Soyuz, worked on the Russian Mir space station, and commanded the International Space Station. You can't get more astronaut experience than that.
Hadfield has also written books before, but until now has focused on non-fiction. His best-selling book prior to this one was the autobiographical An Astronaut's Guide to Life on Earth. But now he turns to fiction, with a thriller set during the Apollo era. But how does it stand up?