Simeon Mahana, 14, is in conflict with his traditionalist grandfather, Tamihana Mahana (Mr Morrison), and as he unravels the truth behind the longstanding vendetta he risks his future prospects and the cohesion of the entire tight-knit society.
Mr Morrison said it was "wonderful" shooting a film set in rural early 1960s of the East Coast, and he vaguely remembered some of that time, since he was born in 1960.
He said it had been quite challenging as a period piece because all aspects, such as the costuming and arts, had to reflect it, and you could not have any kind of modern machinery in the background. He said it is one of those movies where people should make a special effort to see it on the big screen.
"I think our best work comes from our own soil, our own land, our own stories."
Mahana is 15-year-old Akuhata Keefe's first film, having been 14 when he played the part of Simeon Mahana.
He said it had been a good experience and "it was pretty weird seeing myself speaking Maori up there, and even just hearing some Maori language on screen it was cool, it was good".
The movie, directed by Lee Tamahori who also directed the film that made Mr Morrison internationally famous Once Were Warriors, is based on the novel Bulibasha by Witi Ihimaera, author of The Whale Rider.
Mr Morrison said it was a very rich and textured story from that time, which also showed the importance of wool as the major export and interweaves a love story.
He praised the work of local actress Tuhiwhakauraoterangi Wallace-Ihakara who played the role of Hope Mahana, saying she put in a beautiful performance.