There are swimming championships in Putdam! Nelson and Kenny both don't like swimming at all and aren't particularly good at it, but the winner gets to go to the aquarium with the whole class. And they really want that. Fortunately, Grandma Jansje invents a chain that allows you to breathe underwater. Suddenly swimming goes a lot better! Nelson and Kenny even reach the final, but jewelry is banned there... What now? They come up with a plan to get to the aquarium after all. There they come face to face with an old acquaintance... Like a fish in water is the ninth part of the cheerful and richly illustrated adventures of Ninja Kid. Dutch | 192 pages | From 7 years | Hardcover