“Siren,” the upcoming Freeform drama about killer mermaids, may sound like a supernatural fantasy series, but creator Eric Wald is aiming for something a bit more realistic. “Right now, we really do ...

Ryn, a mermaid, comes to land because she is searching for her sister. Donna, her sister, went missing because she was caught in a fishing net and taken by the military. So Ryn decides to look for her ...