Dervla McTiernan was born in County Cork, Ireland to a family of seven.
She studied corporate law at the National University of Ireland, Galway and the Law Society of Ireland, and practiced as a lawyer for twelve years. Following the global financial crisis she moved with her family to Western Australia, where she now lives with her husband and two children.
In 2015 she submitted a story for the Sisters in Crime Scarlet Stiletto competition and was shortlisted. This gave her the confidence to complete the novel that would become The Rúin, which will be published in 2018 in Australia, New Zealand, Germany, the United Kingdom and Ireland. She is represented by Tara Wynne, Curtis Brown Australia.