Probably no other picture book is used more frequently in psychotherapeutic practice than this one. This may be due to the demanding and childlike presentation, but above all to the ambivalent atmosphere that no child (or adult) can escape. Selina makes friends with Pumpernickel, a mouse who seeks refuge from the relentless cat Flora. But Selina is also afraid of the cat, and the mouse can help her with his experience in dealing with fear. He teaches them to face the danger and deal with the threat a sure way to shrink huge cats. The book already appeals to pre-school children. It teaches development-promoting strategies for dealing with anxiety situations and provides a variety of approaches for overcoming them.