Season 1

David, Kristen and Ben assess whether a pregnant woman is possessed when she claims one of the twins she's carrying is evil. Their investigation leads to a fertility clinic where they discover a connection to all of their encounters throughout the season. Also, Kristen questions one of her daughters' capacity for evil upon realizing that she also used that fertility clinic.

Leland tries to get serial killer Orson Leroux's conviction overturned. Kristen is in court when her daughter, Laura, needs emergency heart surgery. David is a witness to a woman's evil nature.

After David is badly wounded, he is determined to fight off the menacing presence of death from his hospital bed.

Kristen, David and Ben are called to investigate an insidiously addictive Christmas song that's spreading among an increasing number of students, and the dangerous relationship between online influencers and their impressionable young followers.

David is shocked to learn he is being sued for inflicting severe psychological harm on Caroline Hopkins, after he assisted in her exorcism. The accusation leads him to question his future as a priest, especially once he develops a very close connection with his defense attorney, Renée Harris.

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.

When Bridget confesses to murder during her exorcism, Monsignor Korecki asks Kristen, David and Ben to investigate if the details match any open cases and if the woman really is possessed by a demon.

The Catholic Church asks Kristen, David and Ben to assess the veracity of a local prophetess, Grace Ling, and 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.

David and Kristen disagree about an exorcism. Ben tries to debunk TV ghost hunters. The girls play a dangerous game with a psychotic schoolmate during a Halloween sleepover.

The team is hired to evaluate a 9-year-old boy who takes a liking to David, which leaves them hopeful they can curb his violent behavior. Kristen worries about her young daughters who lie about a horror game their grandmother bought behind her back.

After a high-strung theater producer's behavior turns from demanding to what is believed to be demonic, Kristen, David and Ben must assess the situation; Kristen discredits Leland Townsend, before he can ruin a 17-year-old boy's life.

Kristen, David and Ben investigate a supposed miracle when a teenage girl comes back to life after being declared dead for almost three hours; Kristen meets with her former boss and runs into Leland Townsend.

The Catholic Church hires forensic psychologist Kristen Bouchard to determine whether a serial killer is possessed by a demon or merely a psychopath.