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Morgan pays a visit to a witness to a serial killer who is being treated at a mental institution. The Unsub has been caught, and his stated goal is to prepare her for the trial.
As they converse, Morgan realizes there are holes in the witness' narrative, and so he pursues a line of questioning to try and help her remember all of the details.
It turns out the whole tale is one involving an extreme case of Stockholm Syndrome: the witness had actually been an accomplice.