Ellery Queen is on the scene and notes that the letter "T" is also the shape of a "tau cross", or Egyptian cross; this seems to lead to a nearby bearded prophet whose invented religion mixes nudism and Egyptology.
Upon arriving at the scene, Ellery Queen observes that the letter "T" bears a resemblance to an Egyptian cross, leading him to discover a nearby prophet who has developed a novel religion that merges nudity and ancient Egyptian studies.