Murder at the ABA (1976) is a mystery novel by American writer Isaac Asimov, following the adventures of a writer and amateur detective named Darius Just, whom Asimov modeled on his friend Harlan Ellison. While attending a convention of the American Booksellers Association, Just discovers the dead body of a friend and protégé. Convinced that the death was due to murder, but unable to convince the police, Just decides to investigate on his own.

Banquets of the Black Widowers is a collection of mystery short stories by American writer Isaac Asimov featuring his fictional club of mystery solvers, the Black Widowers. It was first published in hardcover by Doubleday in September 1984, and in paperback by the Fawcett Crest imprint of Ballantine Books in June 1986. The first British edition was issued by Grafton in August 1986.