If you've ever read a time travel novel and thought "The convoluted plot is nice but what would really hit my sweet spot would be a plethora of angry characters, a less personable Darth Vader and enough extreme violence to make Quentin Tarantino think it's all a bit over the top" then the book for you may finally exist and Neal Asher has made it possible. You might be surprised that it doesn't exist already and maybe it did and I just missed it somewhere along the line (I've read a decent amount of time travel books but not enough to teach a course on them or anything) but if nothing else Asher gets credit for injecting a very high dose of caffeine (perhaps mixed in with something else) into the genre and not caring how it splatters all over the walls.
Most time travel type stories invariably focus on either causing some predetermined event to come about or preventing a temporal paradox from occurring and thus dooming everyone to a dystopian future where everyone has insect heads or takes pictures of themselves all the time but Asher takes a slightly different approach here and focuses mostly on the weapons and advanced science that would be required for people to make repeated attempts to kill each other across time and then proceeds to give them as many chances as he can to do just that. And honestly, on a gut action movie level, it's mostly entertaining.
It doesn't start out very promisingly, as we're treated to scenes of Polly, a girl of the streets going about girls of the streets in the future so often do, which is get addicted to drugs and then proceed to sell their bodies to anyone with lust in their hearts and a fistful of money. If that isn't enough, the kicker comes a few pages later when we find out she's about sixteen. Before long she's like most teenage prostitutes and involved in a scheme with a deceased friend's brother to barter a mysterious device that might be from the future. Of course it goes wrong, the government's programmed assassins show up, as does a weird time-beast and the device winds up attached to poor Polly, who is then subsequently sucked back in time.
Fortunately the book is not ten pages long and she survives, as does the programmed government assassin, Tack, who falls in with someone from a far future human race called the Heliothane, who are engaged in a war with the Umbrathane and are led by the aptly described Cowl, who is attempting to wipe out human history through the use of his "tors" (one of the scales that is now attached to Polly) and his monstrous tor-beast, which while it sounds like something Conan would have beheaded in about five seconds, turns out to be rather difficult to kill. Before long Polly is jumping back further and further in time, Tack has been reprogrammed to kill a different group of people who he hangs out with a Traveller and everyone gets involved in a far flung war that keeps telling us it has high stakes but seems to come down to "don't get killed".
The action movie comparison I made earlier is really quite appropriate here. We are very far away from the urbane explorations of HG Wells or even the poetic ruminations of Bradbury's "A Sound of Thunder", from the get-go we're treated to scene after scene whose message boils down to "stuff just got real". He throws out futuristic concepts that seem only vaguely based in science and uses them in a constant game of oneupmanship that would make Doc Smith blush, as everyone is only a few seconds away from coming up with a more sciency violent concept or pulling out another rabbit from the Hat of Mysterious Science. The story barely stops to take a breath, which is good because the quieter moments tend to make the story drag somewhat as it gives you a chance to think about what everyone's motivations are and once you get beyond the aforementioned "don't get killed" it tends to get a bit murky.
Yeah, it's a bit shallow, despite the story seeming to think at times it's anything but. When the high octaneness of it throttles down slightly, you find it suffers a bit from having both too much and not enough going on. There are number of plots happening all at once but most of them seem to be occurring without any relation to each other, whether it's Tack and Traveller bonding throughout time, Polly bumbling her way through various historical eras or the remaining Heliothane being mostly interchangable (he gives us a traitor and then, as if playing with us, gives us a second traitor just to make it harder to identify who is who). Occasionally Cowl himself or his tor-beast shows up to make everyone's lives briefly miserable but neither has really enough presence to hold the book together. We're told in hushed tones how advanced and clever and evil Cowl is but when he's not around he barely seems to exert any influence on the atmosphere and when he shows up he's a generic heavy dressed all in black whose claim to fame is killing people in extraordinarily violent ways. But since most of the cast has that ability it turns out to not be that special.
The characters very rarely take hold and even when they start to the book shifts gears to someone else so none of it really has a chance to stick (which may be the biggest problem with the book, none of the concepts, torbeast included, has a scene long enough to really acquire any real weight). Polly doesn't have a heart of gold thankfully but her stone skipping through various eras mostly gives us a chance to enjoy the somewhat snarky dialogue between her and an involuntary computer implant and marvel at how Asher makes every single era of human history, even the parts without humans in it, feel exactly the same. Tack is a tough guy learning how to live beyond his programming while Traveller is your usual wizened soldier that would probably be played by John Hurt and while there's some spark to their conversations as they grow to have begrudging respect for each other, most of their dialogue is taken up with explaining what the heck is going on. And then Traveller becomes absent anyway.
As for the rest . . . they're present. Asher has one decent idea, in that as you slide down a probability curve you have to expend more and more energy to get back to the main timeline but he gets so caught up in making stuff explode and that the decapitations are suitably epic that instead of an escalating arms race to see who controls time we get people mostly beating each other up over and over again, and then retreating so they can plot how to do it all over again. The book itself even points out that the Heliothane and the Umbrathane aren't that much different, except that one side has Cowl and there seems to be no better way to put it. A last ditch effort toward the end to imbue some character depth winds up being an improbable stab at romance between two people who have barely been in the same room for most of the novel, but at least its a chance for some self-reflection in between all the talk about high level future science.
And yet, despite being unnecessarily convoluted, possessing few memorable characters, vague stakes and a villain whose menace rarely causes shivers in excess of the feeling of nearly missing the bus, Asher does his best to make it as entertaining as possible. He keeps the ideas coming in a rapid fire style and to some extent that alleviates the fact that we barely linger on anyone long enough to really get to know and care about any of them (most of them aren't all that likable anyway) and he manages to keep what amounts to a fairly thin and simple plot (i.e. a combination of "let's not mess up time" and "let's not get killed") going for far longer than the bones of it would dictate. A sense of wonder would help, a sense of humor would really help (apparently this is unlike Asher's other books in that respect and there's a couple good one-liners that suggests he was holding back for some reason) but if you're looking for all out science action that won't leave a residue (or much of anything at all) when it's done, this is as good a candidate as anything else. I didn't hate it and in fact enjoyed the breakneck pace of it, but it felt a little empty overall and there's a good chance that if I spot it filed away on my bookshelf in a few years I'm going to have to reread this review to remind myself that I even read it.