Kingdom of Water: A Graphic Novel (the Rema Chronicles #2)

"Even though Rema's portals no longer work for Tabby, she hasn't given up on finding a way back to her world. Her father's last words urge her to search for a lost geist prince, but the escalating hunt for geists means that Philip and the others are in more danger than ever. When Philip is apprehended, Tabby must expose the lost history of Rema and those who want to distort it. But the secrets of the geists, Tabby's father, and the ghost that haunts them threaten to overturn everything Tabby knows--and change her relationship with Philip forever"--