Princess Lana can't seem to speak up in class at the Royal Mermaid Rescue Crew School, even when she knows the answer. It's much easier to chat with her new friend, a horned creature named Spike. With Lana's help, Spike discovers he's a narwhal, and together they swim north to find his long-lost family. The chilly Northern Seas are full of new adventures--but also an emergency! Can Lana finally find her voice and save the day, or will she freeze up?