The Two Princesses of Bamarre (The Two Princesses of Barmarre #1) by Gail Carson Levine

A kingdom beset by monsters... A disease that weakens and destroys... An epic poem and a hero of long ago... A story of danger and desperation.

Two sisters in a magical kingdom, Princess Meryl and Princess Addie. One is brave, the other is fearful -- and both are as close as sisters can be. Meryl has promised Addie that she will stay with her until Addie is married, to fight Addie's dragons and defend her sister from evil. But when disaster strikes, it is Addie who must overcome her fears and set out on a perilous quest.
She must face ogres and spectres, gryphons and dragons, for it is down to Addie to save her kingdom, and to save her sister's life.

Genres: Young Adult - Fantasy - Fairy Tales - Romance - Adventure - Dragons - Magic - American Author