Former policewoman Clare Mackintosh has beaten JK Rowling to the Theakstons Old Peculier crime novel of the year award.
Harry Potter author Rowling was shortlisted for Career Of Evil, written under her pen name Robert Galbraith, but lost out to Mackintosh with her debut thriller, I Let You Go.
Mackintosh spent 12 years in the police force but left in 2011 and became a full-time writer.
The crime-writing prize is now in its twelfth year, with previous winners including Val McDermid, Lee Child, Mark Billingham, Sarah Hilary and Denise Mina.
Mackintosh, who will receive £3,000, beat off competition from a shortlist of six British and Irish authors whose novels were published in paperback between May 1 2015 and April 30 2016.