Corinna is a villainous German noblewoman who tries to get access to the riches her deceased father has bequeathed to the family’s dog called “Sergeant Pepper”. She is portrayed by the well-known German actress, Barbara Auer.
Felix, a young boy, becomes the dog’s best friend and is even capable to understand what he “says”. Together with his sister Felicia, he tries to protect Sergeant Pepper from the greedy and ruthless Corinna. The aristocrat succeeds, however, to abduct the poor (but extremely rich) dog and even tries to kill him. Sergeant Pepper is shot and seriously wounded, but survives this assassination attempt. Corinna claims she shot the dog in self-defense (which is a lie, of course), but when the police arrive, she is taken into custody.