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After two undercover DEA agents are murdered and a third goes missing, the BAU joins the NSA to investigate whether an underground Internet drug syndicate is involved. Meanwhile, Hotch hopes the probe helps find the "Dirty Dozen" hit men ring.
Castle and Beckett hunt for a psychic's murderer while debating the validity of her profession. Then they receive a letter from the victim written the day of her death predicting her demise, but it could be the work of the killer.