When Harper Row's brother, Cullen, disappeared overnight, she attempted to track his movements using the city's public wi-fi hotspots to trace nanobot communications. Unfortunately, she learned quickly that more than just a few cases she and Red Robin had been tracking were infected with the nano-virus that got her brother. She has since found that the infected are being sent out day and night to gather materials - and she's traced the one sending those commands to a warehouse in the Narrows. Whatever that person wants, it involves building something.