Grafton had been fascinated by mysteries series whose titles were related, such as John D. MacDonald's Travis McGee series, each of which included a color in the title, and Harry Kemelman's Rabbi Small series, each of which included a day of the week in the title. While reading Edward Gorey's "The Gashlycrumb Tinies", a picture book with an alphabetized list of ways for children to die, Grafton decided to write a series of novels whose titles would follow the alphabet. She immediately sat down and made a list of all of the crime-related words that she knew.