Investigating a mass murder at an internet security company in Virginia reveals the butchery is not the work of a typical serial killer.
Jane and Maura investigate a modern witch hunt; Frankie's old girlfriend returns with a surprise.
Kate's original crime is revealed; Locke and Eko discover something interesting about the film; Michael has a mysterious encounter with a computer.
Led by Rousseau to a mysterious captive in the jungle, Sayid becomes determined to find out whether the man is one of the "Others."
Convinced he will be sent to jail, Hal imparts fatherly advice and confesses to Malcolm about his poor work ethic.