This speculative fiction is set in the present day just as we know it now. One day, an inexplicable and apparently impossible event happens; this novel is about how this affects the people involved, but also governments, media and everyone else. I thought it was all handled plausibly, which is essential in this kind of story. I could nitpick a few plot points, and especially the response to the final twist, but still I enjoyed this book. I could definitely see a sequel or even a multi-season TV show.
I have been careful to give away nothing about the book’s premise, because I think I would have enjoyed it more if I hadn’t read the blurb. If you are considering reading it, I wholeheartedly endorse that course of action. But don’t read the back of the book.