Between 1887 and 1891 he wrote several novels in collaboration with David Christie Murray, such as: One Traveler Returns (1887); A Dangerous Catspaw (1889); The Bishop's Bible (1890); He Fell Among Thieves (1890); and Paul Jones's Alias (1891).
("Catspaw", the first episode shot with the Chekov character, would be aired a month later to roughly coincide with Halloween).