Good books aren't always easy to find, here are some that I have enjoyed.
The Rangers Apprentice series. It's about an intelligence force in medieval times.
The Maze Runner This is a series that I just finished. It's about a boy named Thomas who wakes up in a Maze, with no memories, and a bunch of other teenaged boys with him.
Sacagawea A book told from the perspective of Sacagawea's son as he finds out the story of Lewis and Clark's adventure. Sacagawea had accompanied them as a translator. It's a good book, although sometimes a little difficult to follow.
Ahsoka This is a Star Wars Fanfiction off of the character Ahsoka Tano, Anakin Skywalkers Apprentice in the Clone Wars series. She survived Order 66, and this is her story a year after the Republic fell.