Over 30 years after its presentation, the all-wheel drive vehicle from Ingolstadt has long achieved cult status. When it was introduced at the Geneva Motor Show in 1980, it was the first mass-produced car with all-wheel drive. In the following years, the alliance of the four rings with the best rally driver in the world, Walter Röhrl, proved to be unbeatable. In the book about one of the most interesting chapters of vehicle development, author Jan-Henrik Muche illustrates the history of its creation, from the first study through the initial prototypes to series production.