This is no ordinary mermaid adventure! Felicity and Sophie wish to return home from their first underwater escapade, as told in: 'Mermaid Secrets'. All that needs to happen is for their mermaid tails to be turned back to legs. Sounds simple, right? After all, all that's required for the potion are a few shells. Well, it would be, but these are special shells, and can only be found deep in the ocean within the domain of the feared Giant Squid! It's a job for merman, King Stephan, and his army, but impulsive Felicity can't wait for them, and makes plans of her own. Only, she doesn't just lead herself into danger!When she fails to return, King Stephan fears the worst, and even Sophie and Felicity's beloved Magic Book might not be able to help them this time!But all is not as it seems, as with a 'twist in the tale' the past finally catches up with King Stephan. Long held secrets unravel to reveal a life-changing stack of lies, in this fast-paced and nerve-jingling underwater adventure!