Welcome to The Authority, Slate’s deep dive into the world(s) of HBO’s His Dark Materials. Each week, Slate’s scholars of experimental theology Dan Kois and Laura Miller discuss the HBO series and Philip Pullman’s original trilogy. This week, they cover Episode 4 of Season 2, “The Tower of the Angels,” in which Will meets the subtle knife, Lee meets the Hot Priest, and Mary Malone meets Dust. Plus: a deep dive into the Guild of Philosophers and the mysteries of the subtle knife.

Email: asktheauthority@slate.com

Podcast production by Phil Surkis.

Dan Kois on Twitter: @dankois

Laura Miller on Twitter: @magiciansbook

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