Ashley Dyer is a writing duo based in the United Kingdom.

Margaret Murphy is a Writing Fellow and Reading Round Lector for the Royal Literary Fund, a past chair of the Crime Writers Association (CWA), and founder of Murder Squad. A CWA Short Story Dagger winner, she has been shortlisted for the First Blood critics' award for crime fiction as well as the CWA Dagger in the Library. Under her own name she has published nine psychological suspense and police procedural novels.

Helen Pepper is a senior lecturer in policing at Teesside University. She has been an analyst, forensic scientist, scene of crime officer, CSI, and crime scene manager. She has coauthored, as well as contributed to, professional policing texts. Her expertise is in great demand with crime writers: she is a judge for the CWA's Gold Dagger for Non-Fiction Award, and is a forensic consultant on both the Vera and Shetland TV series.