Enna Burning by Shannon Hale
This is the sequel to The Goose Girl (the second book of the Books of Bayern Series). It is an excellent book just as the first was. This book is a lot faster paced and has a lot more action to it. It is a book about a war and a girl who can burn things at will so it does contain some violence, but all in all it is clean and appropriate for most readers. I really enjoyed reading it!
The nearby country of Tira is about to attack Enna's home country of Bayern. Enna's brother discovers a parchment that teaches him how to manipulate fire, he uses his new powers to help in the war. When the power proves to great for him Enna faces a choice. Will she follow in her brother's footsteps and burn to help in the war, or will she resist the call of fire?