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 works for the Mental Health Commission. In 2015 she submitted a story for the Sisters in Crime Scarlet Stiletto competition and was shortlisted. This inspired her to complete the novel that would become The Ruin. She lives in Perth with her husband and two children.