I am currently reading The Indifferent Stars Above by Daniel James Brown, as well as That Hideous Strength by C.S. Lewis.

The Indifferent Stars Above - Daniel James Brown
This is a historical account of the Donner party, and so far I am very much enjoying it. The writing is gorgeous, and it is demonstrably well researched and aims to stay within the realm of history without diving too far into speculation. I'm maybe one fifth of the way through so far, and I'm keen to keep going.

That Hideous Strength - C. S. Lewis
This is the third and final book in Lewis's Space Trilogy, and I'm not far enough in to have many concrete thoughts yet. I read the first two books around 3 years ago, and found it very difficult to get into That Hideous Strength as it is very different than its predecessors (and twice as long!). I've heard mixed things about the book, though the general consensus among the people I've spoken to is that it is dense, rich, and possibly the best book in the series. I'm excited to continue, and fingers crossed I'll be able to complete this attempt.