He wanted to entrust Sherlock Holmes to help him find a picture of him with a beautiful opera singer, Irene Alder. He told Sherlock Holmes that if the picture exposed, his marriage with the king of Scandinavia's daughter would come to nothing. And in fact, the owner of the picture was exactly Irene Alder. Thus, in order to find the photo, the king had tried to send someone to steal her home and even search her luggage, but he still didn't find the picture, and this is the reason why he decided to ask Holmes for help