The serial was written and directed by Meatball Fulton, as a sequel to the 1972 story The Fourth Tower of Inverness, the first in the series.

To complicate matters, there is a trickster loose in the hollow walls, who removes objects and replaces them with something else; Jack loses the clothing he brought with him and Lady Pompon her favorite teapot, but they receive in return what appears to be Lord Jowls' clothing from the 1920s and a foot locker full of fake feet.

Jack calls upon Mojo Sam the Youdou man to help stop the mysterious force from shaking Inverness apart, while he helps Little Frieda complete her nearly 30-year-long mission to collect all of Saint Sey's bones from within the only occasionally visible Fourth Tower.

There are some characters from previous adventures, aside from Jack: Madonna Vampyra, Old Far Seeing Art and Wham Bam Shazam, back from a stint at the Cordon Bleu cooking school in Paris; Chief Wampum and Doctor Mazoola play important roles behind the scenes.

Characters new to this series include Madame Trunknose, who talks to crows, Lady Pompon and her niece Evie, who are working on Lady Pompon's memoirs, the Mask Maker who carves masks and hollows out a giant mushroom to create a cottage, and an operatic diva, Madama Maltzo Paltzo, who discovers that the spaces within the walls form a marvelous concert chamber.