Mayoral candidate Burke Cavan hires rogue magician Dr. Phantasmo to use his hypnotic powers to disrupt the campaign of this opponent, incumbent Mayor Hillford.; While on a vacation cruise along the North Atlantic coast of Canada, Mandrake, Lothar, and Narda become involved in a plot to force fishermen out of business in order to buy their property on Bundy Bay, a place of extreme high and low tides.