Tinā is the story of Samoan teacher Mareta Percival. Struggling after the death of her daughter in the Christchurch earthquakes, Mareta reluctantly takes on the role of substitute teacher at an elite, wealthy private school and is surprised to find children crying out for guidance, inspiration, and love. Using the symphony of her culture to empower her students, she forms a choir, bringing them together while unexpectedly rediscovering her passion for being a teacher and mother.