Follow the trail of the perpetrators in nine unsolved cases! A mysterious malfunction of a steamship, a changed painting, a spoiled circus act or a theft in a laboratory... these are just some of the many intricate mysteries that await the brave detective. Read testimonies, view crime scenes and compare evidence. After completing seventy fun tasks, you will surely find out how it all was. And if not, nothing happens: you will find a solution at the end of the book.