First Swim “Are you sure?” Shannen traced her fingers over the ornate shell hanging around her neck. At her feet, the surf lapped the sand in gentle, foamy waves. “Absolutely,” Lily insisted, backing into the water. “Come on.” Shannen trusted her best friend. Really, she did. But this? She was having trouble wrapping her mind around it. She took half a step forward. “Explain it again.” The surf tickled her toes. “It’s magic. There’s nothing to explain.” Shannen had to give her that. When you learn your best friend is a mermaid—a mermaid princess no less—you kind of start taking a lot of things on faith. Things like a magical shell that can grant a human the ability to breathe underwater. But that faith didn’t stop Shannen’s heart from beating faster. Or her hands from trembling s

