Margaret Murphy has written nine psychological thrillers – both stand-alone and police series. Her work has been published in the UK and the USA, and in translation across Europe, receiving accolades from broadsheets and tabloid newspapers alike, as well as starred reviews from Publishers’ Weekly and Booklist in the USA. Her novels have been shortlisted for the First Blood critics’ award for crime fiction, and the Crime Writers’ Association (CWA) Dagger in the Library; she was the joint winner of the 2012 CWA Short Story Dagger. Margaret is founder of Murder Squad, a touring group of crime writers, and in 2009-10 she was Chair of the CWA. She was RLF Writing Fellow in Liverpool and Chester from 2008-2011, and has tutored creative writing at Masters level, as well as presenting talks and workshops in creative writing for library groups and literature festivals. She has been a countryside ranger, science teacher and dyslexia specialist, and her lifelong passion for science is reflected in her painstaking research for her novels. EVERYONE LIES is her first collaborative novel with forensic scientist Prof. Dave Barclay, under the pseudonym A.D. Garrett.

Professor Dave Barclay is a world renowned forensics expert and Senior Lecturer in Forensic Science at Robert Gordon University, Aberdeen. Professor Barclay has worked on some of Britain’s highest profile murder cases. He is also a former head of physical evidence for the UK National Crime and Operations Faculty, where he was involved in reviewing more than 200 murder investigations, cold case reviews and inquiries into alleged miscarriages of justice, including the Bloody Sunday inquiry, the Omagh bombing, the World’s End murders in Edinburgh, and the Milly Dowler and Soham murders.

His extensive experience also led him into becoming an adviser for the BBC television series ‘Waking the Dead’ and more recently, the Channel Four documentary, Dispatches, invited Prof Barclay to Praia da Luz, Portugal to review the Portuguese police investigation into the disappearance of Madeleine McCann.