In a uniquely personal journey to mark the centenary of the partition of Ireland in 1921, award-winning reporter Peter Taylor revisits the films he has made over the past 50 years to reflect on the controversial issue of a united Ireland.

With frank and intimate observations, Peter reveals how his own understanding of the issue has evolved: from the early days when he took a Hull bus driver and his wife to Belfast, and a group of Catholic and Protestant children to Wales, to his revelatory interviews with MI6 officers and others involved in the secret talks between the British government and the IRA that eventually led to peace.