S. R. Masters studied Philosophy at Girton College, Cambridge before working in public health and health behaviour for the NHS. He is a regular contributor to UK short fiction anthology series The Fiction Desk, having won their Writer's Award for his short story Just Kids. His story Desert Walk was included in Penguin Random House USA's Press Start to Play collection and he continues to have short fiction published in a variety of magazines. He grew up around Birmingham but now lives in Oxford with his wife and son. The Killer You Know is his first novel.