While fishing, a ghost ship suddenly appears out of the fog and rams the friends' boat; the children now have to help the captain.
Prof. Knox accidentally shrank in a self-experiment and tries to get the attention of F&F.
F&F have a new computer game, but Lupo does everything wrong and finally all three are drawn into the game.
Papa drinks too much coffee and has to reduce his consumption for health reasons. Mama knows her husband and has everything prepared so that he can't get coffee in the whole city. It finally ends in the coffee factory.