Turbulence in the Bathtub: How do you tame a water sprite in a small apartment? It all started while collecting shells at the Baltic Sea: Jonathan accidentally swaps his bucket of shells with that of a beautiful stranger. Inside that bucket is a nix, a real merman. He ends up at Jonathan's home and causes nothing but chaos. The nix makes the bathtub overflow, speaks only in rhymes, and can turn invisible. He performs acrobatics in Jonathan's school bag and around the entire class, until Mrs. Kägele, Jonathan's teacher, becomes quite annoyed. And then the nix falls in love - with none other than Mrs. Kägele herself.