CCTV footage of a suspicious vehicle leaving Westhaven leads Washington and the team to a warehouse on the edge of London, where they uncover bomb-making materials and evidence that seems to confirm that the bombers were Islamist. But the discovery of what appears to be military equipment and high-grade explosives on site makes Lana question the real identities of the bombers, and a further device left in a sensitive and provocative location seems to confirm her suspicions.