The producers of Predicament, now filming in South Taranaki, today confirmed the roles of Flight of the Conchords star Jemaine Clement and musician Tim Finn in the film.

Novel Productions said Clement would play the character of Spook and Finn would play Martin Williamson in the adaptation of Ronald Hugh Morrieson's novel of the same name.

The pair flew into New Plymouth a week ago amid speculation they had roles in the film, but Novel Productions refused to confirm their involvement at the time.

Newcomer Hayden Frost had been cast in the lead role of Cedric Williamson, with Australian comedian Heath Franklin playing Mervyn Toebeck and Rose McIver, who recently wrapped Peter Jackson's Lovely Bones, cast as Maybelle Zimmermann.

The crime comedy tells the story of Cedric, who conspires with misfits Mervyn and Spook to photograph and blackmail wealthy adulterous couples.

Author Morrieson lived in Hawera in South Taranaki until his death in 1972.

Predicament was published posthumously in 1975, and his other three novels, The Scarecrow, Pallet on the Floor and Came a Hot Friday, have all been adapted into feature films.

Filming would continue in Hawera and Eltham until the end of August, and the film would be released in New Zealand and Australia next year.