With a trail of new clues, Danny, Lexi and Violet travel across a dangerous chemical wasteland in Kazakhstan to Aralsk-7, an abandoned bio-weapons facility. Meanwhile, Chuck begins his investigation about how the Vatican and the Spirit Banner are connected.

Lexi is kidnapped after making a shocking discovery. Shaw uses an underworld contact to help him and Danny discover her location and face off against the Khan's interconnected gang of criminals.

The pieces of the Khan's end-game fall into place as Danny and Lexi must put their differences aside in order to stop the Khan and Simon before it's too late.