Mary O'Neil is an Irish woman whose life and love are hemmed in on all sides by social prejudice and religious intolerance. She repeatedly clashes with her family and church in her attempts to get a release from a marriage gone bad, to marry the man she does love, and to legitimise the child she has with him.
In an interview with a journalist from Adelaide's Advertiser, John Cosgrove indicates that he had removed some of the more contentious incidents from Hall Caine's controversial novel. He also records that his play offers a happy ending rather leaving Mary O'Neil's fate open-ended.
1917: Tivoli Theatre, Brisbane; 28 July - 7 August
1917: Tivoli Theatre, Adelaide; 20-26 October.