Disturbed is the twenty-first episode of the fifth season. It was released on 1 May 2009.

Charlie, still feeling guilty about Don's injury, focuses on finding a frighteningly intelligent serial killer who is meticulous about eliminating all witnesses to his crimes, thereby murdering unobserved and undetected.


  • There is a dual sense of the inhumane behavior of the killer and the perturbation of Charlie's worldview brought about by his awareness of Don's mortality and his own fallibility.
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