Definitely gets a little bit darker and more challenging than the previous two books, but the way the story weaves together is well worth it. 

Pretty good, I really like the time travel aspect. I've always loved stories that have this kind of interconnected non-linear time travel narratives. That being said, I do miss Calvin as a character, I feel like more could have been done with him in this and the previous books.

So, this has one thing the other two installments do not: the racism. It's a shame, L'Engle could have easily tried to angle more for a "nurture over nature" tale by leaning into the O'Keefe angle, but it's clearly the nature, not nurture, that is key to this narrative, favoring blue-eyed Welsh ancestry over the indigenous people. It also contradicts the other two installments on a thematic level- the entire second book was centered around a strong theme of "Where doesn't matter" and yet where very much matters here in this book, to the point that Calvin and Meg's strong kythe apparently has no bearing on the plot and she can't reach out to him in London. While the plot is well written and constructed as always, the racism is the literal linchpin of the story. You will miss nothing by skipping this one.