I noticed another "January’s free book":
The Flow of the New Testament: A book by book guide to the New Testament by Dale Leschert
https://www.logos.com/product/15543/the-flow-of-the-new-testament-a-book-by-book-guide-to-the-new-testament
- no longer free
- Sad
— Edited
It's free now, till the end of the month. Seems like it was accidentally marked as free ahead of time when you found it? It's the second free book of the month.