No One Can Hear You is a 2001 New Zealand thriller directed by John Laing.
[1][2] New Zealand author Nikki Crutchley wrote a book No One Can Hear You in 2018, not related to the film.
[3] A thriller about an ordinary family whose life is disrupted by a house-guest who turns out to be a serial killer.
[1][2] The film was classified as "Suitable only for 15 years and over" by the British Board of Film Classification.
[4]