Demetri and Agent Banks attempt to track down a killer as questions arise about
the universe course-correcting itself, when people who thought they'd escaped
their fates are found dead; Mark reluctantly agrees to help Simon find his
sister, Annabelle, but discovers he's withholding the truth about her true
circumstances; the FBI discovers the identity of Suspect Zero; and Nicole learns
the whereabouts of Keiko - the woman in Bryce's flashforward - but struggles
with whether to share this information, due to her growing feelings for him.
