Author Elizabeth Knox says she was so upset by the film adaptation of her book The Vintner's Luck that she cried for three days.
Ms Knox says she could not understand why director Niki Caro left out essential components of the story, including the central gay relationship between an angel and a French winemaker.
She says there were many people who loved the romance in the book and she never thought it would be so downplayed.
Ms Knox says she saw the film only five days before it was shown in Toronto and wishes she had seen it earlier.
However, she says the film version of the novel was beautifully shot.
Radio New Zealand was unable to contact Ms Caro on Thursday morning.