I also didn't get through my April book in April - just finished it a couple weeks ago. War Trash, by Ha Jin.
So this was super interesting, though the writing style (written as a memoir of one of the characters, so in his voice/from his POV) was kind of flat, I thought (though it makes total sense in the context of the story). Subject matter-wise, though, this was one of those books that makes me feel so woefully uneducated about certain corners of history. It covers the later years of the Korean War, but takes place almost entirely in POW camps in South Korea, where Chinese troops (from still relatively newly established Communist China) were held by South Korean and US forces. So, very based in fact but obviously fictional. A lot of the book is really about the conflicts between different factions of Chinese troops, reflecting Chinese politics at the time, rather than conflicts between POWs and their captors (though there's some of that too). Not something I had ever thought about at all, really. So I can't say this was a fun read, but it was well-written and definitely educational.
My May book, which I will also not be finishing in time, is Friday Night Lights by H.G. Bissinger. Non-fiction book about a football-crazy Texas town in the late 1980's is pretty much the opposite of what I just read. I'm about 1/3 through, good so far, even though I am not a football person (at all). (But I have seen the movie adaptation, and I absolutely loved the TV adaptation of this book, so I'm probably primed to like it to some extent.)