Vanessa is tragically out with the flu, but is temporarily replaced by guest Broderick Greer. Broderick and Casper talk about liturgy in the Episcopal Church. Broderick teaches Casper about marginalia, the practice of annotating religious texts. He learned the practice from his grandmother and her engagement with her bible.
In the Owl Post, Casper finally has his time to explore owl-related questions. Many listeners share his interest. One listener asks why owls are used in the Wizard World, when it seems logistically difficult and very visible to Muggles. Another listener wonders why the Ministry of Magic doesn’t track owls that are sent to Sirius Black in order to find him in the Prisoner of Azkaban. Casper toys with the idea of supersonic owl flight and an airborne owl-only port key network. He exhibits an impressive amount of ornithological knowledge in his hypotheses.
With Vanessa gone, Casper takes the opportunity to explore another one of his interests, taking a voicemail about Percy Weasley. Casper ends the episode by saying it was lonely in the studio without Vanessa, not because of the absence of her charm and wit, but because sometimes she brings Casper chocolates and he had to do without.