Mark, Demetri and Wedeck try to find a connection between Janis' attack and a separate attack made on them. Meanwhile, as Halloween approaches, Olivia confronts Mark about his flashforward, Demetri and Gough track down a clue that was foreshadowed in Mark's flashforward, Lloyd's son, Dylan, goes missing from the hospital, and the elusive Simon makes contact with a reluctant acquaintance.
