The second novel of six that describe mysteries solved by the Black Widowers, based on a literary dining club he belonged to known as the Trap Door Spiders. It collects twelve stories by Asimov, nine reprinted from mystery or science fiction magazines and three previously unpublished, together with a general introduction, and an afterword following each story by the author. Each story involves the club members' knowledge of trivia.

Contents
1   When No Man Pursueth
2   Quicker Than the Eye
3   The Iron Gem
4   The Three Numbers
5   Nothing Like Murder
6   No Smoking
7   Season's Greetings
8   The One and Only East
9   Earthset and Evening Star
10  Friday the Thirteenth
11  The Unabridged
12  The Ultimate Crime