Fuelled by rage and a need for vengeance, Erica begins to track down the three men who killed David. Meanwhile, she strikes up a friendship with Detective Sean Mercer (Terrence Howard), who is investigating the vigilante killings around the city, and eventually comes to suspect her when he learns the vigilante is female. Mercer takes Erica with him to interview the prostitute she had saved, but the prostitute does not let on that she recognizes Erica. Erica, after learning of a particularly frustrating case for Mercer, kills the suspect. Mercer privately indicates to Erica that he suspects her but is struggling with what to do about it.