A potential tragedy surfaces right before Pope Sebastien arrives and Marcus has to intervene. Also: Tomas gets a life-changing opportunity, but his past mistakes may stop it from materializing, and a new problem threatens the Rance family.
More conflict surfaces as Marcus, Tomas and Mother Bernadette race to defeat the demon. Also: the church's enemies get aggressive as the Pope's visit approaches; Angela encounters a familiar face from her past; and Kat ponders a new future.
Family bonds start to break as the daughter remains missing. Also: Marcus requests Mother Bernadette's help with a new problem; news of Casey's possession goes public and Father Bennett is put in danger while investigating the Tattersal corporation.
Casey's story goes public, causing a media frenzy for the Rance family and throwing Father Tomas into the spotlight. Elsewhere: Father Bennett attends a papal planning event and Marcus scours the city's underbelly for answers.
Angela becomes restless as her daughter's condition worsens while the demon targets innocent people. Also: Father Tomas gets a visitor from his past; Marcus receives guidance from an unlikely source; and an unsanctioned exorcism is debated.
Father Marcus joins Tomas after he escapes from Saint Aquinas and urges him to get his ex out of his life. Also: the Rance's relationship with the demon deepens; Marcus catches Angela stealing holy water; and bizarre ritual killings surface in Chicago's south side.