The Dragon in the Sea — Kate Klimo

This excellent series is solidly middle grade, accessible, and adventure-filled. In The Dragon in the Sea, Dragon Keepers Jesse and Daisy, help their dragon, Emmy, as she tries to protect an egg which holds her baby brother. Their adventures take them into the Watery Realms, a world filled with mer-people, selkies, and water zombies. Magic, mayhem, and an unusual cast of charaters make the reading fun, and the wonderful relationship between the dragon keeper cousins and their dragon add both depth and dimension.