In The Katabasis, a modern day convent-based mystery drama unfolds as a Jesuit priest and a nun enter into a psychological tug-of-war which culminates on the night of the Winter Solstice. Father Bennett realizes his true relation to the Sirian mystery. This discovery proves to be an integral factor in bringing about a baptism of fire through the Hidden God, which they both must endure. As a result of this baptism by fire, Sister Marcia undergoes a radical change in her ontological status from a quiescent nun to a moon goddess under the aegis of the lunar current. Father Bennett then embarks upon a journey which ends with a remarkable revelation about his true destiny in relation to the coming Black Aeon.