Far out in the ocean live the Shell-Keeper mermaids. While the rest of the world sleeps, one little girl joins them for some magical mermaid adventures. Swimming with the turtles and tropical fish in the ocean reefs has always been such fun for the mermaids, but now the reef is dying and the sea creatures are losing their homes. Molly must help her friend Coral find her magic shell, so she can rescue the reef – but the wicked Dark Queen and her army have other plans… Can you keep a secret? By day, Molly Holmes is just like any other little girl, but by night, she becomes the secret mermaid, in this magical new series.