When the Catholic Church asks Kristen, David and Ben to assess the veracity of a local prophetess, Grace Ling, they are shaken when they see one of her visions come to life. Also, David struggles with jealousy when he sees God speaking with the prophetess, and to Kristen's dismay, her mother, Sheryl, and Leland begin a relationship.

When David recognizes one of the sigils in the Poveglia Codex from his father Leon's artwork, he and Kristen journey to a remote art commune to investigate its meaning and how it's related to David's family.