Dr Gwen Adshead has worked as a forensic psychiatrist and psychotherapist in the NHS for three decades, including within prisons and secure hospitals. She has published over one hundred academic works; holds an MA in Medical Law and Ethics and an honorary doctorate from St George's Hospital Medical School and has lectured widely, including the BBC Reith Lectures in 2024. She is the co-author of the Sunday Times bestseller The Devil You Know. Eileen Horne is a writer and dramatist. She worked for twenty years as a television drama producer and has been an editor, media lecturer and translator. She is the author of three non-fiction books and the scriptwriter of numerous BBC radio dramas. She is the co-author of The Devil You Know.