The battle for the coral city of Aelenium has begun. Soledad, Walker and Buenaventure arm themselves with pistols and swords, ready for the armies of kobalins and cannibals set to overrun the city, while Griffin mounts a flying ray, to attack from the air. Meanwhile, Jolly and Munk - the polliwiggles destined to try to save the world - dive to the bottom of the ocean. They must travel to the Rift in the sea-bed to confront and defeat the evil force known as the Maelstrom. It is commanding the sea-monsters and the cannibals. Its goal? To destroy all humankind. There will be many battles, and many struggles - both inward and outward. And more than one transformation. Can Jolly and Munk work together after all they've been through? Who is the mysterious Aina, and will Munk see her for who she really is - before it's too late? Will the friends all survive this terrifying and exhausting war for the survival of their world? And what role do the enigmatic Water Weavers play? Be swept away by this breathtaking torrent of adventure!