A Change of Tide - The Legend of the Salt of the Earth, #1

Emma has fifteen days until she dies.  Possibly.  Psychic-medium, 18-years-old, and currently rocking the "weird girl" label at Otter Sands High School, Emma Hugos has been walking around for the last eleven years knowing she will very probably die. She saw a hazy, confusing vision as a kid that featured two other girls, streamers, and lots and lots of screaming.  Now in her senior year, she's finally figured out who the other two girls are: Nikki Rodrigues, the army brat who just moved to town and found out she's a witch, and Nelly Hansen, the local almost-pro surfer who just found out she turns into a mermaid and is totally devastated.  All Emma has to do now is seamlessly blend her own magick with a witch's magick and an unwilling mermaid's magick to stop her vision from coming true.  What could possibly go wrong?