Inside Out and Back Again by Thanhha Lai is a good book I recommend. I don't know if this counts as lesser-known, but anyways, it's a good read. It's historical fiction and it's in verse, which I always think is an interesting writing style. It also has a sequel called When the Clouds Touch Us. 

We definitely need a thread like this! I've also noticed a lot of focus on KotLC and Percy Jackson and that sort of thing - and vArIeTy iS tHe SpIcE oF lIFe~

Here are some of the lesser-known books that I like:

-Magic or Not and The Well-Wishers, by Edward Eager. They're fantasy, very original and intriguing, with humor, excitement, and wonderful characters. Old Mrs. Green, an opinionated artist... Dicky LeBaron, a cocky tough guy who turns out to have a different side to his character... Mrs. Gordon T. Witherspoon, a Force of Nature... I need to know these people in real life, why don't they exist???

-The Fair Adventure by Elizabeth Gray Vining. This one's about a girl growing up and trying to pursue her dream of being an artist. It has wonderful writing, vivid and descriptive, and lovely characters and is just overall super enjoyable :)

-The Bagthorpe Saga series, by Helen Cresswell - very British and utterly hilarious. It's about the antics of a large and eccentric family. Everybody in it is completely quackers, and yet somehow, chances are you've met somebody like them (I know I have). The first one, Ordinary Jack, is best, but the first six books are all really good. Each one has at least one paragraph which made me practically die of laughter XD

-The Merry Adventures of Robin Hood, by Howard Pyle. Told in melodious medieval-sounding English, this is a collection of tales about Robin Hood and his merry men - their adventures, defeats, and triumphs.

-Bed-Knob and Broomstick, by Mary Norton. When three children discover that their next-door neighbor Miss Price is a witch, they are drawn into a magical adventure of traveling through time and space, into unexpected worlds that change them forever.

All, I know I say this all the time, but The Missing Piece of Charlie O'Reily by Rebecca K. S. Ansari. C'mon. Read it. It's not necessarily underrated (it's gotten praise, and so has her other book), but it's not as well known as some other books. It's amazing, and such a page-turner. It's chock full of plot twists. It's mysterious and fantastical, and while it gets a little creepy in some places, it mostly contains themes of family, magic, love, and forgiveness. If you like it, you should also read her second book, The In-Between, which was also good.

I don't want to spoil anything, and the best way to get an idea of what the book is about is by reading the actual summary, but the basic idea is that it's about a boy named Charlie who's supposedly an only child. The problem is, Charlie knows he has a brother. He remembers the brother clearly. But one day, Charlie's brother, as well as any evidence of his existence, disappeared, and everyone seemed to forget him, except for Charlie. Now, a year later, Charlie and his best friend, Ana, the only person who believes that his brother is real, are going on a journey to try and find his brother once and for all.

Read it read it read it! And let me know what you think!

Show Us Who You Are by Elle McNicoll is really good, and so is The Swifts by Beth Lincoln. Show Us Who You Are is about a girl named Cora who learns about a company that makes digital copies of people, which she thinks is great until she learns that the digital copies of people have been perfected, and The Swifts is a murder-mystery that reminds me a bit of ski lodges, set in an old manor house and about a family where everyone is named a word and expected to live up to that definition.

Aha and the Jewel of Mystery by Blanche Boshinski a very quick read, but srtill very interesting and cool. It's set in ancient Egypt, and from the perspective of a palace cat.

Brady by Jean Fritz I love this book so much! The timeline is in the slavery period of america, and Brady (who is the main character) found out about an underground railroad nearby his house.

I Lived On Butterfly Hill by Marjorie Agosín This is a reffugee story about a girl who is sent from her home when Chili is upturned by the new government.

Paint the Wind by Pam Muñoz Ryan This one tells the story of a girl who has lost her parents and lives with her Grandmother, who forbids anything and everything, from fun to friends. One especially lonely summer, Maya is sent to her mother's family, who owns a ranch in the rural west.

The Shakespeare Stealer by Gary Blackwood I like this story only because I like some shakespeare, and anyways, this boy is sent to steal a play from Shakespeare himself while getting new friends and family-- things he never really had.

Some of these books such as Aha are really old and I'm not sure if they're in Libraries, but my mom is a book fanatic so we have a ton of old books and stuff. :)  

Hummmm...

I just finished a couple of lesser-ish known books but I really liked Layoverland by Gabby Noone. It's about a girl (Bea) who dies and goes to purgatory (which is an airport.) In order to go to heavan, she has to help 5,000 souls find out what is keeping them from going to heavan. Really short and sweet and I enjoyed it!  

Miss Peregrine’s Home for Peculiar Children. I found this book very interesting, it’s about a boy who goes to this an island and travels back in time to discover secrets from his grandfather’s past.