Coral and Bone - Tiffany Daune
Is this a mermaid story? I just don't know. But what I do know is that our protagonist is discovering some cool new powers along with a mysterious underwater world called Elosia. She learns that her life has been a lie and discovers some truths about her past along the way. When those who deceived her come for help, she has to choose whether to walk away or use her new powers.
Inland - Kat Rosenfeld
Between - Megan Whitmer
A YA novel about a girl whose family get separated by something supernatural, and she is whisked off into another world to be kept safe while others look for them. Charlie learns that this world is full of myths and legends, and that a group known as The Fellowship is protecting them from human discovery. The bad news is that she was one of those who were being protected, but she never knew it. Danger soon follows as the magic begins to fail and creatures begin to die, and all of it is linked to Charlie.