Kohanga reo, or 'language nest', is a unique and innovative programme for babies and pre-schoolers, based on a simple but powerful principle: total immersion in Maori language and values. More than 25 years on the movement can be seen as a turning point and cornerstone for Maori, in the fight to revive the language - the heart of any living culture - for future generations. The impact and influence of kohanga reo is profound. These days it is taken as given that children can grow up and do all their learning – from pre-school to primary and secondary school - entirely in te reo Maori, anchored by that early immersion experience. International groups, inspired by the success of kohanga reo, have used it as a model to create native language nests in their own corners of the world. And many of the original generation of tamariki have come full circle, and are back in the kohanga reo fold with their own young ones. This documentary, by director Tainui Stephens, examines the struggles that led to the growth of this movement - and the woman at the forefront of change, Iritana Te Rangi Tawhiwhirangi. An inspiration to many, a thorn in the side to some, Tawhiwhirangi is a woman whose reputation precedes her as someone unafraid and compelled to speak her mind. She is one of a generation of leaders who emerged in the post-war era to take the Maori world forward into the future, and her influence has ranged across government, broadcasting and tribal issues, and of course, education.