As the cops try to recover from an explosive event, they must also investigate a series of arsons; a man from Chris' past emerges.
Nikita talks Birkhoff into using $20 million of his own money to lure Percy into a trap; Birkhoff is arrested.
Jake juggles multiple cases; Tinny's relationship with her uncle becomes strained.
The Helix crashes and Shalimar is missing, Mutant X races to find her and the mutant with healing powers before Dominique's men capture them. (Lexa introduces The Dominion)