Poorly written is being nice. This is probably the worst book I've ever had the misfortune of buying.
I made the mistake, I thought it was the other John Barnes. Don't do the same. You have been warned.
It was like reading something a 12 year old might put together if you asked him to write a war story.
I am posting this because I made the mistake of buying this and I don't want others to make the same mistake, wasting their money.
Dan Samson is a 20th century man who has finally passed a moral threshold, earning the right to make just such a backward journey. He dies and wakes as a past version of himself, usually selfish, petty and often evil. In every case Dan seems to arrive just in time to realize what crap his past incarnation has dug himself into but also in time to have a slim chance of turning things around. The other common thread is that he always seems to die in battle. Fate plays a big part in his career choices, friends and particularly, his enemies. You see, Dan is not the only one with past lives.
John Barnes' writing is tight and riveting but it's the ideas that make his books special. Each of us struggles with inner demons but nothing like Dan's. He is a good man who must constantly work to convert garbage into gladiolas despite the hatred and entrenched expectations of everyone around him. I have often wanted to go back and do things differently, through Time Raider we get to share in the ultimate extension of that desire.
Finity gets off to a good start. The (first-person) narrator speaks in stilted, self-centered prose like, perhaps, a character from a R.A. Lafferty novel. It becomes apparent, after a while, that he inhabits a world that seems to have a changing past. Not only that but this changing past seems to be different for everyone. And then there is the matter of the United States having gone missing.
It's an interesting premise until it turns into a road trip. Then the story begins leaking steam. One of the characters turns out to be a red herring. (Or something very much like a red herring.) People you've just begun to know turn out to be expendable or not around for all that long for other reasons.
The mess is polished off with a couple of dream sequences that might have been adapted from the rendezvous of Picard and Kirk (well, not really, but ...). Quirks of physics and mathematics explain everything away.
Overall, underwhelming. Not a bad book to be stuck on an airplane with (which is where I read most of it) but there's better reading to be had. Much of it, in fact, with Barnes's own name on it!