Forensic psychologist Kristen Bouchard is hired by the Catholic Church to work with David Acosta, a priest-in-training, and contractor Ben Shakir, to determine whether a serial killer is possessed by a demon or merely a psychopath. Kristen finds that she has a taste for the work and is invited to join the team on a permanent basis.

Kristen, David and Ben are called to investigate a supposed miracle when Naomi Clark, a 17-year-old soccer player, comes back to life after she had been declared dead for almost two hours. Kristen meets with her former boss at the Queens District Attorney's office, where she runs into Leland Townsend.

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

Kristen, Ben and David are hired to evaluate Eric, a seemingly psychopathic 9-year-old boy. Eric takes a liking to David, which leaves them hopeful they can curb his violent behavior. Also, Kristen is most affected by this investigation as she worries about her young daughters who lied about a horror game their grandmother, Sheryl, bought behind her back.

On Halloween night, Kristen and David are sent to assess an exorcism, but once the pair analyzes the situation, they are at odds while trying to determine whether it is a supernatural demonic possession, or severe mental disease escalated by physical and mental distress. Also, Ben goes on his favorite show, "Demon Hunters," where he debunks their supernatural finds with fellow unbeliever Vanessa.

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.

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.

When David recognizes one of the sigils in 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.

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.

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.

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

Leland assists Orson Leroux with having his conviction overturned. Kristen is called into court to testify while her daughter undergoes emergency heart surgery. While paying a visit to a woman in need of spiritual advice, David fears for his safety after witnessing her evil instincts firsthand.

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. Kristen questions one of her daughters’ capacity for evil upon realizing that she also used the same fertility clinic.

The team is given the task of evaluating the likelihood of Leland being possessed, which if decided true, would require them to exorcise him.

The team is charged with investigating a man who claims that he is hearing an angel.

The team encounters a nine-year-old girl, Mathilda, who is seemingly haunted by a Jinn, a spirit in the Islamic faith.

The team is sent to investigate the disappearance of a teenage boy, Wyatt.

Father Mulvehill asks the team for a confidential evaluation, as he fears that he might be the victim of diabolical oppression.

After the shooting of an unarmed woman, the team is tasked with investigating the police officer who pulled the trigger.

The team is dispatched to a monastery to investigate the corpse of Father Thomas, whose body has not decayed in the year following his death.

Kristen, David, and Ben are sent to Cornell University, at the request of Bishop Marx, to investigate an electrode-based experiment.

Bishop Marx tasks the team to investigate a UFO sighting, spotted by an air force pilot.

Ben, David, and Kristen investigate the RSM Fertility clinic - since so many of their past cases have led back to the ominous clinic.

The IRS taps the team to investigate the legitimacy of a new organization seeking religious status for tax exemption.

At Dr. Boggs' request, the team is introduced to a recently widowed Catholic named Nathan, and his teenage son, Elijah.

The team is sent to meet on campus with Mitch Jasper, a student with a growing compulsion to eat human flesh.

David's relationship with Kristen takes a turn when he gives into his temptation. Meanwhile the team is tasked with exploring a machine to measure the weight of the human soul as it leaves a dying body.

Kristen, David, and Ben face the horrors of the internet as they investigate a Slender Man-style meme that scares teens into committing blasphemous acts in order to avoid death. Leland trains Sheryl in the fine art of online trolling.

Sister Andrea joins the team to fix a demonically possessed marriage.

The team encounters a truck driver whose wife thinks he is possessed and explores the possibility of a demon haunting the highway.

Sister Andrea's career and sanity are on trial as she battles Leland. Meanwhile the team investigates an alleged angel sighting.

A single mother enlists the team to look into the potentially demonic ways the viral app TipTop is terrorizing her family.

The team investigates a young man who is being held against his will to determine if he is possessed or is influenced by a cult.

The team responds to reports of possessed toys and electronics originating from a store. David is tasked with retrieving a hidden message that may be the key to saving the prophet Grace Ling.

The team investigates claims that a demon has been stalking people who have invested in a stock tip. The Entity asks for David's help in transitioning Grace Ling back.

The team investigates a household terrorized by a demonic infestation and is shocked when they find out the house is next door to Kristen's. Meanwhile, Kristen is surprised to learn that her frozen egg was never destroyed and purchased anonymously which leads her on a new adventure.

Kristen learns the details of Leland's evil scheme involving her ovum, and Sheryl's involvement in the plot increases the tension between mother and daughter. Meanwhile, David, Ben, and Kristen are sent to investigate a particle accelerator suspected to be a gateway to Hell.

Kristen learns the details of Leland's evil scheme involving her ovum, and Sheryl's involvement in the plot increases the tension between mother and daughter. Meanwhile, David, Ben, and Kristen are sent to investigate a particle accelerator suspected to be a gateway to Hell.

Kristen, David and Ben look into a possible werewolf attack that isn't what it seems. Andy grapples with his mysterious trauma. Ben uses science to solve his Jinn problem.

Potentially demonic pork products lead Kristen, David, and Ben to a pig farm to investigate. David increases his remote viewing skills and Leslie, the surrogate carrying Kristen's child, comes to her for help.

Andy is pushed to deadly measures as the team investigates a speech demon.

The team visits the Vatican as sinister forces besiege the Bouchard house.

A possibly possessed dancer leads Kristen, David and Ben to a dance troupe with coven-like practices. Sheryl reaches her breaking point with Leland.

Ben and David join a train engineer who believes he is being haunted on the tracks. Kristen cares for her mother. Ben begins to question his sanity, impacting his relationship with Renee.

David stumbles into the life of a man planning murder-suicide and the team rush to find him. Sheryl executes her plan to stop baby Timothy from becoming the Antichrist.

The team looks into bizarre text messages. Sheryl tries to beat Leland.

Kristen must protect her family. Sheryl and Leland's war peaks.

Kristen must protect her family. Sheryl and Leland's war peaks.

The team receives disappointing news. Kristen meets mysterious stranger Ellie, who claims to be an old friend of Sheryl's. A game between the two reveals disturbing information about Kristen's future and about Ellie herself.

Sister Andrea gives the team their last assessment, a man who believes his doppelganger has possessed him and has a personal connection to the nun. The three also look for new jobs, and David receives even more bad news. Dr. Boggs faces a tough decision as Leland's trial begins, and the court turns out to have even more treachery afoot.

The Vatican asks the team to investigate a Hawking-like genius for potential ties to the occult. David's continued aiding of the Entity produces physical effects, and he and Sister Andrea say goodbye to St. Joseph's. Meanwhile, Leland returns home, where David confronts him.

An ominous countdown begins after the Bouchard girls start a new game on their VR goggles. The Entity moves to stop the Sixty, despite Sister Andrea's warnings. The team receives an offer they never expected. Kristen faces a final threat as Leland takes matters into his own hands.