Story follows the gardener's daughter Mary as she visits a wealthy household where Flora loses a cherished gold thimble. A thorough search turns up nothing and Mary’s emphatic denial arouses suspicion, prompting adults to weigh kindness, discretion, and fairness while guiding the children. The narrative weaves a framed tale told by Mr. Lee and offers reflections on truthful speech, humble charity, responsibility, and empathy across social lines, with gentle moral instruction aimed at young readers.