https://www.logos.com/product/49622/saint-augustine-melanchthon-and-neander-three-biographies
It's down to $2. Let's see if we can get it down to $1 by the end of the week.
It's by the great historian Philip Schaff ("one of the most distinguished church historians who ever lived. He was educated at Tübingen, Halle, and Berlin, and was professor of church history and biblical literature at German Reformed Theological Seminary."), and it's about three important people: Augustine, Melanchthon, and Neander. What's not to love about this?
