Molly Lefebure, born in the London borough of Hackney, was descended from several prominent French men of letters. As a child, she spent summers on a farm in Exmoor, where she learned to hunt; she later wrote about hunting for The Field and Country Life. She worked as a newspaper reporter after studying journalism at King's College, London. During World War II, she served as secretary to Dr. Keith Simpson, head of the Department of Forensic Medicine at Guy's Hospital and Home Office pathologist. She wrote about the experience in Evidence for the Crown (1954), aka Murder on the Home Front. In 1945, she married John Gerrish, with whom she had two sons. She became a group therapist and youth club counselor, and the author of some 20 other books, including novels, biographies of the Lake Poets and their circle, books about the Lake District, and other nonfiction. She also wrote numerous radio and television plays, short stories, and articles for magazines and journals. She helped establish and run the famous annual Wordsworth Summer Conference at Grasmere in the Lake District.