Tail of an Angel

Jillian is your everyday high school girl with a boring life, until she takes a family vacation on her family yacht. The yacht sinks in a hurricane, leaving Jillian to survive in the ocean with nothing but what's on her raft. After crashing into a rock and waking up on an island, she discovers a secret that no human is allowed to know. Will she keep the secret to protect the ones she loves? Will she stay on the island forever? Who is this person who's been watching her for a very long time? What lies beneath the water?