When a young woman, Katie Duncan (ALEKSA PALLADINO), goes missing after a priest performs an exorcism on her, her brother asks Martin for help. Katie had spoken fondly of Martin because she interned at the FBI when Martin was still working on white-collar crimes. Martin and the team soon discover that the priest, who also vanished, was suspected of murder a year ago when a man died during his exorcism. They also learn that Katie scheduled the exorcism because her mental illness, which she had managed with medications for many years, began making her feel like she was possessed by something dark. Meanwhile, Jack and Anne (recurring guest star MARY ELIZABETH MASTRANTONIO) forge ahead with their plans to buy an apartment together as they prepare for their baby's birth. DEE WALLACE (E.T. the Extra-Terrestrial) guest stars as Lara Duncan, Katie's mother.
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