I think every girl goes through a mermaid phase. Mine was a nice, healthy length, perpetuated by the pool we had while I was growing up, a lifelong love of fairy tales and mythology, and Disney’s The Little Mermaid. Now that I’m older, I do still have a special place in my heart for The Little Mermaid—both the Disney movie and, now, the original tale by Hans Christian Andersen. In particular, I’m drawn to the sea witch. So drawn, in fact, that I finally wrote the little origin story that’d been swirling around in my mind since I was a child. It’s called The Price of Magic, and I’m thrilled…