As it states in the foreword (entitled 'Final Thoughts'), this is the fifth and final volume in the 'Quantum Gravity' series. It has been a quite remarkable series and the final volume does not disappoint.
The series has slowly changed over time, although the characters have remained constant. The first volume struck me as a 'fun' cross between, if you like, '
The Terminator' and '
Lord of the Rings'. But even in that first volume, it seemed that the elves, demons, faeries and all were metaphors for beings from different dimensions ('realms') opened up to Earth ('Otopia') after the Quantum Bomb. There was always a 'hard-science' edge to it all that stopped it sliding into typical fantasy.
The second volume slowly got more serious as travel between the realms and some needed character development fleshed out the bright ideas of the first.
The third continued straight off from where the previous stopped. But then the fourth, starting fifty Otopian years later, almost lost me. It is one of the most hallucinatory, trippy novels I've ever come across. Enjoyed it hugely but struggled to keep up with the twists, turns, multi-dimensional universe and multi-manifesting characters. I ended up just 'going with the flow', hoping that it would start to make some kind of sense somewhere along the line.
And, in this final volume, it just about does. After the serious weirdness of the previous book, this perhaps seems almost mundane in comparison. But there are subtle and careful explanations and reminders woven into the first third or so of the story. And after the more overtly 'magical' previous volume, we return to a sort of 'hard science' base again. For example, here's Xaviendra, drunk on faery beer, describing dragons:
'Dragons are archeotypal subdeic elementals, pre-dating the actualisation of the seven worlds and instrumental in their creation, by virtue of being organising principles and generative structures within which any amount of conscious realisation of the infinite may occur at any time. Persistence in material form occurs as a necessary process of becoming baryonically bound. Personality and etcetera accrue after this manifestation into linear temporal planes according to the usual principles.' (P36)
I hope you followed that. There's a good one for angels, too. And it is all relevant.
At first maybe it seems a little slow but then, curiously, in the middle third or so, on the surface it becomes faster, with Lila zooming off in her jet boots, facing down gangsters and vigilantes, drinking beer with Malachi in his yurt, cruising on her motorbike. And you kind of think 'yes, but what has this got to do with the plot?'. But underneath all this action, the main story is building slowly, in a sort of subterranean way, until in the last third, it surfaces like an iceberg. There's not really a big, final shoot-'em-up. Because of the slow build, it's much more satisfying than that, as all the threads (just about) tie up, all the surprises, twists, bluffs, double-bluffs - and all the games - come together into a worthy final scene.
It is, of course, well written. But it is also, now, complete. I've had my doubts in previous volumes, but I am very glad I stuck with it. This final volume is more than adequate reward. But, at the same time, I'm kind of glad that it's all over. Now I have new worlds of Justina Robson's to look forward to.