I read the book Dragonwatch by Brandon Mull for ISR. The setting is located at a fantasyland called Fablehaven. The main characters, Seth and Kendra then went on a journey at Wyrmroost, where dragons live.
At the start of the story, Seth and Kedra was warned that there will be a dragon storm at Fablehaven. After that, a wizard asked if they could go to Wyrmroost to become the caretakers of dragons. The wizard believe if they do so, they could probably stop the dragon storm. They accepted the offer and became the caretakers. They soon find out the dragon king is trying to destroy the Blackwell Keep, the keep that keep human caretakers safe