"Crumb lives in a small house on the outskirts of the city. She enjoys playing with her friends and she is happy. But one day she realizes that not everyone on earth mean it well with her. Crumb get scared and don't what to do, but then she learns to say ""no. """ A children's book for kindergarden and primary school from the successful violence prevention project "The Hedgehog File", which celebrates its 20th anniversary in 2018.