Sinopsis(1)

Sam and Dean enter a small town in Iowa, where three men have inexplicably beaten their wives to death. The brothers realize that behind the murders is a siren, a creature that can take different forms, desperately needs love and compels people to destroy themselves as a show of devotion. The siren eventually puts Sam and Dean under her spell and pits the two brothers against each other in a fight to the death. (Warner Bros. UK)

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