Although best known as the novelist behind the celebrated Tailorstown trilogy, Christina began her writing career with the publication of her memoir, My Mother Wore a Yellow Dress, in 2004. The publisher was Neil Wilson, Glasgow.
This was followed in 2006 by a most unusual book on the paranormal, commissioned by Gill and Macmillan, Dublin. Christina co-authored it with her husband. An American version appeared in 2007, published by HarperOne, San Francisco. It was The Dark Sacrament: True Stories of Modern-Day Demon Possession and Exorcism.
Christina had garnerned a considerable number of true-life accounts of hauntings in Ireland during her research. She collected a number of them, and the Poolbeg Press, Dublin, published the collection in 2010 as Ireland's Haunted Women.