Pearl of the sea

"Since her mother left, Pearl has spent more and more time in the ocean, fishing to help her father pay the bills. When she gets mixed up with a group of illegal abalone poachers and starts diving near a restricted wreck, Pearl meets an ancient sea monster named Otto--who isn't quite as monstrous as she thought. When Otto's enemies come back to finish what they started, Pearl is the only one who can save him, but only if she has the courage to let go of her past and open up to others"--Provided by publisher.