Bibi and Tina take a short trip to the lake. The fact that Chico not only starts working at the Martin's farm, but also comes along with them to the lake, does not suit Bibi well. She thinks Chico is a show-off and is hiding something from them. Many people gather around at the lake. Alex is doing a field piece for the radio about "mermaiding" and interviews an attractive girl named Danny. Freddy and his friends Henk and Klops want to cool off as well, but they cause some trouble and push Chico into the water. He seems to drown, because he can't swim. Bibi saves him with a brave jump into the water. Excitement! Bibi and Tina can't even go for a swim themselves, because they have to go back to the Martin's farm. Chico stays with Alex and rides back to the castle later that night. That was his goal all along, because he thinks Count Falko is his father, but he does not reveal his secret.