In today's episode we talk to Haley Cohen Gilliland about her new book. Based on interviews with the protagonists of this recent and continuing piece of Argentine history, the book looks at the Grandmothers of the Plaza de Mayo and their search for their disappeared family members.

The story is a fascinating one, and the book traces through several generations, from the 20th century context which provided the context for the military junta to emerge, the complex personal struggles which still take place today when someone discovers their links to one of Argentina's darkest episodes, and that they are not who they thought they were.

In the final episode of the series we trace the protracted decline of utopia. Split into rival settlements, the inhabitants will gradually abandon their communal ethos. Meanwhile, legal and financial problems in Australia will further undermine the project and its ideals. Finally, we look at what happened afterwards - William Lane's strange political U-turn, the scattered countries where New Australians ended up, and the lives of the descendants of those who remain in Paraguay to this day.

Today's episode covers the moment when the New Australia project cracked and splintered into separate settlements. We look at the reasons for this split, and how it manifested itself.