Sylvie and Bruno Concluded continues the adventures of the many characters in the previous volume Sylvie and Bruno. The fairy-children Sylvie and Bruno are charming whenever they appear, their fairy companions such as the Professor delight in taking ideas to their logical (and humorous) conclusions, and many nonsense songs are sung. Meanwhile, the mortals (comprised of the unnamed narrator, the gracious Lady Muriel and the sententious Arthur) tend to become the vehicles for Carroll's regular sermons on morality and proper Christian values.