Suffering from early-onset dementia or cognitive impairment.

After Tomas decides he must help the Rances, he investigates a strange noise in their attic. He witnesses a rat being supernaturally killed and is briefly confronted by a possessed Casey , though she quickly reverts to a "normal" state when her mother arrives.

The episode ends with "Tubular Bells" (the theme from the original movie) playing as Marcus prepares to leave his retreat, signaling his return to the fight against evil. Atmosphere and Style Chapter One: And Let My Cry Come Unto Thee

Suspects a demonic presence in her home.

The story follows , a progressive but inexperienced priest in suburban Chicago who begins having vivid, terrifying dreams of an older priest, Father Marcus Keane , performing a brutal exorcism on a young boy in Mexico City. These dreams are later revealed to be real events that occurred 18 months prior, suggesting a supernatural connection between the two men. Simultaneously, the Rance family is falling apart: