I'm almost speechless. 
 This is one hell of a nonlinear exploration of a repeated life, as can be deduced from the title, but it's also a lot more. It's also a lot better, too. 
 I loved the premise from the get go. All Groundhog Day but stretched for a whole lifetime, and Harry isn't alone. There are others with effective immortality sharing info through repeated but changeable timelines, allowing for a linear continuation of a setting that can be changed with every single revision. 
 Claire North did an absolutely fantastic job exploring all the ramifications and rules of the existence, but more importantly, she spun a fantastic tale of exploration and intrigue, revenge, and implacable willpower. 
 Whatever might have begun as a rather humdrum initial character quickly became one of the most fascinating and deep character studies I've had the pleasure to read in quite some time. More importantly, I didn't even have to stew over it, because the writing was as clear as crystal despite the inherent risk of an inherently complex tale falling apart due to being told out of order. 
 Of course, this was an absolutely fantastic novel. It didn't fall apart at all. More importantly, it sucked me right in even as I wanted to be a part of the premise and the world and DO things there. 
 For a long while, there were no distractions that I had to focus on exclusively, and I liked that aspect. 
 Later on, this changed entirely, and it was smart and intense. The later development was very warm, with an extremely sympathetic and likeable villain. I was pretty amazed that it took several lifetimes to finally wrap up satisfactorily, and it truly did satisfy. 
 This was a serious piece of literature. I'm surprised and kinda shocked that it didn't make the Hugo list last year. If I had this lifetime to do over, I'd make sure everyone knew this was a serious contender and make sure people knew it was a shoe-in. As it is, I'm pretty sure this novel will stand the test of time, and if there is any justice in the world, people will still be mimicking or talking about it 20 years from now. 
 Yes. It is that good. 
 Truly excellent depth and exploration of both story and character, and a premise that is superior to almost any time travel tale I've ever read. I got done with the Lives of Tao series not too long ago, and I really wanted to compare the two because they were close in time and subject, but after reflection, I have to say that this novel is superior in style and seriousness. The other was just plain fun. This one made me believe.