Supernatural (TV series)/Recap/S07/E07 The Mentalists

Season 7, Episode 07:

The Mentalists
Sam and Dean discover that an angry spirit is killing off resident mediums in Lily Dale, the most "psychic" town in America, but with a town full of people claiming to be summoning spirits, they have some trouble finding the true medium who's controlling the ghost.

Tropes
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 * Boy Meets Ghoul -- that's the implication.
 * Ghostly Chill -- the first sign that there is an actual ghost working in Lillydale
 * Heartwarming in Hindsight -- one psychic tells Dean that a woman named Ellen says she'll "kick his ass if he doesn't tell him how bad things are." Ellen's watching over them. That, and at least one psychic was real.
 * Phony Psychic -- a town full of them
 * Scooby-Doo Hoax -- at least one of the mediums has a fairly elaborate set-up to fake ghosts for her clients
 * Teeth-Clenched Teamwork -- on Sam's part. Dean doesn't think he's done anything wrong