Caos en el parque de atracciones (Mermaid Magic, 4)

Merlinda and her friends Sasha and Nerissa didn't travel from Sirentropia to the surface for fun. Their kingdom is in danger, and they need to find magic pearls before it's too late. But when they've spent the entire morning pulling plastic and wrappers from the sea instead of oysters, Tyler manages to convince them that a little time at the amusement park isn't going to sink any kingdom. Miscalculation. Because Redbeard, the pirate who's been chasing Merlinda for as long as she can remember, has also arrived there. And he's brought company: his sea monsters are hiding in the Haunted Swamp Train, where a group of high school kids have just snuck in, thinking it's a state-of-the-art attraction. The mermaids will have to rescue them, neutralize the creatures, and confront the pirate, all without anyone discovering who they really are. Easy, right?