Her numerous television credits include playing the title role in Jane Eyre (1973), Casualty (1994–1997), Coronation Street (2008) and Father Brown (2013–2022).
Cusack has made many film and television appearances including Inspector Morse (“Cherubim and Seraphim“, S6:E5, 1992) as Joyce, The Bill, Casualty (as Staff Nurse / Ward Sister Kate Wilson from 1994 to 1997), a BBC adaptation of Jane Eyre (1973), and the film Snatch (2000) as the traveller mother of Mickey, played by Brad Pitt.
She played Mrs McCarthy, the housekeeper and parish secretary who makes award-winning scones.
Her West End appearances include Maggie in Dancing at Lughnasa and Monica Murray in By the Bog of Cats with Holly Hunter.
On Broadway she played Nora Clitheroie in Sean O'Casey's The Plough and the Stars and Lily Doherty in Brian Friel's The Freedom of the City at the Lincoln Centre in 2000.