The Mermaid's Madness — Jim C. Hines

There is an old story -- you might have heard it -- about a young mermaid, the daughter of a king, who saved the life of a human prince and fell in love. So innocent was her love, so pure her devotion, that she would pay any price for the chance to be with her prince. She gave up her voice, her family, and the sea, and became human. But the prince fell in love with another woman. The tales say the little mermaid sacrificed her own life so that her beloved prince could find happiness with his bride. The tales lie.

If you want to know the real story, a tale not of unrequited love and noble sacrifice but one of madness, murder, and magic gone awry, Danielle, Talia, and Snow -- a.k.a. Cinderella, Sleeping Beauty, and Snow White -- are the three princesses who can tell you what really happened. They were there when everything fell apart, and unthinkable tragedy struck the kingdom of Lorindar. And they were the only ones who stood a chance of setting things right, not only for Queen Bea and Lorindar, but for the merfolk as well....