"I am sure," said the king, "that this man is the most faithful and virtuous of men. If he wished to take my life, why did he cure me? Cease to speak against him. I see what it is, you are jealous of him; but do not think that I can be turned against him. I remember well what a vizir said to King Sindbad, his master, to prevent him from putting the prince, his son, to death." What the Greek king said excited the vizir's curiosity, and he said to him, "Sire, I beg your majesty to have the condescension to tell me what the vizir said to King Sindbad."
"This vizir," he replied, "told King Sindbad that one ought not believe everything that a mother-in-law says, and told him this story."
–“The Story of the Greek King and the Physician Douban,”
Andrew Lang
What is unique about this story?
Which plot element is missing from the story?