Historical fiction where I can learn about WW2?

My attention span is fried from years of screen addiction and I'm trying to get back into reading like I did when I was a kid.

Also extremely ADHD and currently interested in learning about World War 2, but I haven't yet managed to convince my brain to enjoy reading non-fiction books like I used to, so I'm wondering if there were any fiction books you could recommend (standalone or series) that describe real events / geopolitical themes so that I can actually enjoy developing a baseline understanding of what happened and why, without desperately wishing for the empty stimulation that gaming brings.