In the episode of "Grimm," detectives Nick Burkhardt and Hank Griffin take on the other worldly predator, believed to be "La Llorona," which has abducted some of Portland's children on Halloween. Kate del Castillo -- star of Telemundo's hit miniseries "La Reina del Sur" -- guest-stars as Valentina Espinosa, a mysterious detective from New Mexico on an obsessive mission to uncover the truth behind the bizarre disappearances and joins forces with Burkhardt and Griffin to intervene before it's too late.
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