Bodies are washing up on the beach in the sleepy coastal town of Westerkerke. Locals whisper about the Brimskölle-a legendary sea monster said to rise from the deep when the tide turns red. But thirteen-year-old Floris isn't afraid. He's been waiting his whole life for a chance to be a real superhero, and this might be it.When bullies target him and his best friend Haroen, Floris seizes the moment to prove he's more than just a dreamer. But his plan goes terribly wrong... and what he uncovers in the waves will test his courage, his friendship, and everything he believes about heroes and monsters.An action-packed mystery for brave readers 9 and up-perfect for fans of Percy Jackson and Goosebumps!