Three children accidentally get turned into fish after drinking a potion made by an eccentric scientist. The kids end up in the sea, with one problem. They must find and drink the antidote within 48 hours, or forever remain as fish.
Pettson and Findus remember their adventures while waiting for the storm to pass.
Johannes is upset because his parents have divorced and because his father never phones him. Before going to bed he wants his mother to read something from the Bible for him, instead of one...