Joanna uses her esteem as partner at CTS to convince a hydrologist to test Millwood's soil. With reluctant permission from the mayor, Joanna and Billy narrow their list of suspects to a handful of industrial sites in the community.

Joanna and Billy are convinced that the local steel mill and its owner Ben Matheson are responsible for the barrels. A shocking revelation in Joanna's personal life leads her to question everything her father had told her.