I received a copy from the publisher in exchange for an honest review.

Hands down this is my favourite book by Emily St. John Mandel. It's short, but she managed to pack a super engaging story into it. I ended up reading it in one sitting, and absolutely loved the ending. I don't want to give too many details and spoil it, but it links several people across time in a very clever way. One of the time periods occurs during a pandemic and touches on lockdown/isolation - that hit me kind of hard. 

I don't think I would consider this sci-fi; the method of time travel isn't explained and the story itself focuses more on the people and relationships affected by it. That's pretty much in line with St. John Mandel's other books and it's a good balance - I like it.