Hamburg is the most beautiful city in the world!, believes Karli, the nephew of Kugelblitz from South Africa. However, during his visit, he soon learns about the darker sides of the big city: a cleverly organized gang of thieves is making life difficult for the police. Cars, bicycles, and works of art are apparently being stolen on demand. When a valuable cello is stolen from the famous Elbphilharmonie, Kugelblitz is convinced that the cases are connected. Will he succeed in piecing together the investigation with his SOKO Mosaik? A new thrilling mystery from the series of Commissioner Kugelblitz city volumes.