Book 13 follows the children on their quest from the northern coast of Ring Peninsula over to Pinky Peninsula. The children discover a way to cross the sea through some truly remarkable circumstances. While crossing, they come close up to some interesting fish and aquatic mammals of various shapes and sizes. But then something bubbles up to the surface - a faceless monster that is intolerably ugly and endowed with uncommon strength due to its mythically huge proportions. What's worse, this creature has cruel and catastrophic capabilities.