C. Daly King (1895?1963) was an American psychologist and detective story writer. He was born in New York City and educated at Yale University. After fighting in World War I, he worked in textiles and in advertising before returning to school to study psychology, with a particular focus on sleep and consciousness. In the 1930s, King published nine books that quickly established him as a master of the Golden Age mystery, but ceased writing fiction with the advent of World War II.

Martin Edwards is the author of numerous mystery novels and short stories, including those in the Lake District Mysteries and Rachel Savernake Golden Age Mysteries series. His nonfiction work has won Edgar, Agatha, H.R.F. Keating and Macavity awards, and he was the recipient of the 2020 Diamond Dagger award for lifetime achievement. A renowned expert in the genre, Edwards is the series consultant for the British Library's Crime Classics series, the archivist for the Crime Writers Association and the Detection Club, and the editor of 37 anthologies. He lives in Lymm.