Overview:Online, any of us can become judge, jury and executioner. But in this ever-shifting digital world, how do we draw the line between the rule of law, and a digital lynch mob? In this episode, an amateur sleuth seeks justice in the case of a young woman's mysterious death - only to discover that the accused killer is the real victim. Elsewhere, a digital activist takes a stand for social justice then finds himself forced to choose between prison and exile.