A stroke of luck and a world book for everyone. This is the story of Lotta, her brother 'Prince Neumann', and the dog in Grandpa Schulte's dim barn. The dog is fed up with being alone – that's why he tells the children in the shed the story of G. Ott, the great inventor, and Lobkowitz, his best friend. A book about finding and inventing, about the search for security, and above all, a book about friendship.