The film tells the real-life story of how, while researching the Bon Secours Mother and Baby Home in Tuam for a local historical society, history enthusiast Catherine Corless uncovered the devastating possibility that as many as 796 children had been buried in unmarked graves on the property.

The singer-songwriter stars in the 3D concert film, titled Hit Me Hard And Soft: The Tour.

Writer Steven Knight and star Cillian Murphy both said they were immensely proud of the film, which launches in cinemas later this week.