Whenever some pundit or book reviewer decries Young Adult or teen books as somehow not as good as books for adults, don't believe them. (This happens regularly, usually when they think they are talking about an exception to the rule.) I find there are many teen books that are complex, extremely well-written, and compelling, and many books aimed at adults that are simplistic and puerile. So if you're looking for a quick but satisfying read, check out that YA section.
I'm sure I'll write about many YA books for adults in the future, but today I will focus on a few historical fiction books.
The Pox Party (The Astonishing Life of Octavian Nothing, Traitor to the Nation Vol. 1) by M.T. Anderson. A boy raised as a science experiment is given a classical education and sheltered from his status as a slave in New England in the 1760s. Blinders are removed and a pox party changes things. This book is not for the casual reader...you do have to like that 18th century baroque style.
Fever, 1793 by Laurie Halse Anderson. I'm sure you knew our fledgling nation's capitol was in Philadelphia in 1793. Did you also know a yellow fever epidemic claimed around a fifth of the residents? There would have been more if many hadn't fled the city, including George Washington. Protagonist Mattie Cook falls ill despite fleeing, but survives to return to the devastated city.
The Land by Mildred D Taylor. The son of a white landowner and a former slave, Paul Logan is openly acknowledged by his father in post Civil War Georgia. Paul works hard to acquire land of his own. Needless to say, he faces many obstacles. The author draws upon true family stories for her well-crafted books on the Logan family.