Fredi and Hedi find a black puppy while playing hide and seek in the park under the bushes, and they name him Tapps. They take him home and hope just a little that they can keep him. After all, no one knows who Tapps belongs to. The parents insist that the children go around the neighborhood and find out where Tapps belongs. Without success. So Tapps is allowed to stay. But one day, they see a notice in a shop window featuring a dog that looks like Tapps. A friendly gentleman reads the text to them, but this doesn't make the children happy at all. Because now they know where Tapps belongs. And that can't be changed; he has to go back. Hedi and Fredi are so sad that they don't even want the promised reward for finding him. However, Tapps' owner has a whole litter of young puppies and a big heart.