Ms White's In The Rosary Garden has won the 2013 Dundee International Book Prize and will be published by the Glasgow independent publishers Cargo. It is a crime thriller based on infanticide in Ireland in the 1980s.
Ms White also receives a prize of £10,000. More than 350 entries were judged by a panel that included Lorraine Kelly, Brian Cox and novelist AL Kennedy. The judges said the book was "courageous and intelligent".
Last year, Ms White was Leverhulme Writer in Residence at the University of Edinburgh and was the 2008 winner of the Scottish Book Trust New Writers Award.
The author grew up in Dublin and New York and now lives on the Clyde coast.