Second stain: Who stole the secret letter from the house of the Secretary for European Affairs? Sherlock Holmes is called to assist in getting the letter back, "to avert a great war". When the one person Holmes believes could have stolen the letter is found murdered, the great detective is led into a tangled web of international intrigue. The six Napoleons: Holmes and Watson are called upon to solve the mystery of why busts of Napoleon are being smashed all over London.