The End of Everything is about all the potential ways the universe can end. Katie Mack describes the various scenarios and why they’re likely or unlikely, the evidence for them, and what looking into these possibilities can teach us about the universe, even if they all turn out to be wrong. She has a fairly breezy style, but some of the actual physics is pretty hard to understand, so it’s to her credit that it feels comparatively light while also making what she describes clear enough.
Unfortunately, for me, physics is one of those topics that I don’t dislike because it’s hard — though I do find it to be difficult — as because it leaves me very much wondering what the point of everything is. Even biology will leave me feeling that way once I dig too deep, and this isn’t a dig at Mack at all… but it definitely made it harder for me to enjoy this book, because it does deal with those really big topics, and where some people can take joy in all the unknowns and the deep weirdness that we manage to exist at all, it really gets under my skin and makes me feel very small and pointless. I can’t really recommend that as an experience, but if entropy doesn’t get you down and a cold empty universe doesn’t bother you, then this will be much more to your taste!