This book was WILD! I don't want to give away any spoilers, but essentially, there's a lot of time travel and memory stuff and physics and such. The plot is incredibly intricately interwoven, and the characters are fully realized, and I was invested in them far beyond the contraptions of the plot. This book raises a lot of questions about what our responsibility to the world is, what we do with knowledge that may be harmful to others, and what humanity can be entrusted with. It felt weirdly apt for our current COVID-19 moment - it made me wonder how we deal with the things we can and cannot control. This was a very trippy book. Highly recommend.