Number of pages: 668
Oblvion is the final book in the Gatekeepers quintet, and it's by far the longest, being about twice as long as most of the other books.
It opens with all the five main characters split up across the world, so it opens with Jamie appearing at a farmyard in England; Scarlett is in Egypt; Pedro and Scott are in Italy; and Matt is in Brazil, hustling slave traders.
Each of the characters ends up with their own mini stories, all of which bring them closer to the final encounter with "Chaos" in the Antarctic (an under-used character who puts me in mind of the Nights King from Game of Thrones).
Most significantly, events at the end of the previous book, Necropolis, have propelled the main characters, and their companions, including Richard Cole, ten years into the future, so that they are now in a post-apocalyptic version of the world, mostly because of the events of the second book, Evil Star, which took place practically at the same time as the third and fourth titles. This resulted in the book veering into horror territory in one of Jamie's chapters, involving cannibals and crazy people living on the London Underground.
Things are complicated by the fact that one of the main characters betrays the group, and it isn't really much of a spoiler to say that this character is Scott, who out of the main characters has probably appeared on fewest pages of the series so far.
This wasn't my favourite book in the series; the individual episodes varied in quality, and I didn't particularly enjoy Matt's chapters because they felt particularly rushed in places. I noticed that some of the chapters were narrated in the first person by a new character called Holly, who finds Jamie in the first chapter, while everything else was in third person narrative; I wasn't sure why it was done this way, but Holly's narratives were some of the best bits of the book for me.
The ending was satisfying, although I could see many of the main plot twists coming a long way off because they were signalled as far back as the third book, Nightrise, and it does feel very final indeed.
Overall, I was glad that I read all five books, though none of the sequels quite matched the quality of the first book, Raven's Gate.
Next book: The Woman at the Window (A.J. Finn)