Short review: I loved this clones-in-space mystery/science fiction novel. 
 Longer review: In Mur Lafferty's terrific space adventure, clones have existed within human civilization for hundreds of years. There are a set of strict laws governing clone management and clone rights, which are spelled out in the Codicils that appear at the beginning of the book. In the world of Six Wakes, people's mindmaps are saved, then loaded into their new cloned bodies -- produced to approximate age 21 for peak physical condition -- when the old body dies. Clones are sterile; they become their own descendants. Clones essentially live for hundreds of years, from one body to the next. 
 Let me just pause here for a moment and admire the world-building of this novel. We're thrust immediately into this brave new world, and it's fascinating, but the author lays it out in such a way that it's easy to grasp and get totally immersed. There are so many twists and turns and nuances to be revealed, but we get the set-up and big picture from the start. Amazing. 
 The matter of identifying the murderer is crucial, of course. The tension and suspicions run high, and as the story progresses, we learn the truth about each crew member's past. Each has secrets they'd rather keep hidden, but it's those secrets that will help them piece together the events leading up to the murders... and hopefully enable them to prevent another round. And since the initial sabotage included destruction of the cloning vats, cloning software, and mindmap backups, if they die again, they'll really and truly be dead. 
 At times, Six Wakes made me think a bit of Westworld... but my strongest comparison would have to be to Agatha Christie! Kind of a Murder on the Orient Express vibe, but in space! Everyone is a suspect, and everyone may have his or her own motives. They certainly have plenty of secrets to protect. 
 It's just so cool. 
 Clearly, you have to enjoy science fiction to really get into Six Wakes -- although I'd think anyone who enjoys a mystery would love this plot, assuming they accept all the cloning/space/technology pieces of the story. 
 As for me, I loved it. The story is intricate and requires paying attention to the small details, but the payoff is an amazing read that's fast-paced, entertaining, and ultra fascinating. I loved the set-up, the human/clone history, the individual crew members' stories, and the characters themselves, all intriguing in their own ways. 
 I rarely feel the urge to start a book again from the beginning once I finish it, but I definitely did with this one. I'm dying to go back, start over, and see all the clues I missed the first time around. 
 I strongly recommend checking out Six Wakes! So much fun. So different. So awesome.