Sofia The Lagoon Dragon (Dragon Girls #12)

The Sea Dragons have a final adventure left in their quest to save the Magic Forest. One last Sea Keeper needs to be rescued—and it's the most important one yet! Sofia will lead the group using her diving skills. Together, the girls must travel to the depths of the ocean to find a missing magical narwhal. The girls are running out of time before the Magic Forest is left to the fate of the Fire Queen!