This is my favorite Alix E. Harrow book so far! I read it a few months ago for an event I had with her, and then I listened to the audio when it came out and loved it even more! It has two narrators, one for the mighty but conflicted knight of legend, Sir Una, and one for Owen, a historian whose field of expertise is the legend of Sir Una. Owen is sent back in time to help Sir Una fulfill her destiny so that the outcome of her sacrifice results in a better country in the future. But as he goes back in time again and again, and watches her die repeatedly, it becomes harder to guide Sir Una down the path he knows will lead to her demise. (Related: There’s a name purposefully redacted in the text of the book, and the audio makes this really cool noise when it happens, which surprised me the first time, even though I had read it.)