One day, Arthur is dropped off at Sir Ector's door step. Arthur simply pulls a sword from a stone and becomes king. He has many adventures with Sir Lancelot, Galahad, Gawain and many more. It's a book of adventures, fighting dragons, defeating evil sorceresses and battling the evil knights.
My favorite part was when the Green Knight challenged Gawain to chop his head off. He said in a year he would return that stroke. The Green Knight survived the slice, thanks to his magic green belt. Gawain went to a man's house and made a deal with him. Gawain did not follow the rules of the deal. Then, he went to battle with the Green Knight and found out that the Green Knight was the man that he lived with. So the Green Knight only injured Gawain instead of killing him.
I recommend this book for ages 9 and up.