And by recent, I mean, within the last couple of years.
Star Wars: Tarkin
This novel explains the rise and career of Wilhuff Tarkin, up to his appointment as a Grand Moff. It jumps from period to period (boy, young Judiciary Force commander, Imperial Officer), skipping over his appearances in Clone Wars. If you thought Tarkin just got a bad rep for blowing up an entire planet just to test the Death Star, but was otherwise an okay guy, then this book will correct you of that gross misjudgment of character.
Star Wars Catalyst: A Rogue One Novel
This novel starts right near the end of the Old Republic, and goes up to a couple of years before Rogue One: A Star Wars Story starts. It is primarily a story about Galen Erso and Orson Krennic, particularly since Jyn isn’t born, and when she, is she is a young child. It explains some of the hardships it took to construct the first Death Star aka, the 20 year project to build a moon-sized space station. (And yet, they built a second functional one like 4 years later which was larger in size). This book doesn’t exactly endear anyone to Galen Erso, either.