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.

Our lives revolve around money. But a new world order is emerging, one with the power to create currency and bypass governments and regulation. In this episode, enter the world of digital money: from the recesses of the dark net marketplace to workers in China excavating a new form of money; to 'bitcoin miners' struggling to cope with a potentially volatile algorithm; to a young cam worker whose sexual fetishes link them all together.

The internet was hailed for democratizing ideas. But it is also an arena where conspiracy theories and polarizing echo chambers thrive. In this episode, meet an Alt-Right organizer who's using his social network to urge online sympathizers to join his real world rebellion; the desperate parents of a 17-year-old girl, brainwashed into posting White Nationalist YouTube videos; plus, an American-born former Al-Qaeda recruiter who's had a prolific effect on support for jihad.