Follow a link to an author. This will give you a page with an index of the author's works and a couple of sentences of biography. In cases where a particular detective appears in several books, these are grouped together.
Click on an individual book title to go to the detailed listing for that book. These listings look like this:
HANGMAN'S HOLIDAY
UK publication: 1933 (Victor Gollancz)
US publication: 1933 (Harcourt, Brace)
Detective: Lord Peter Wimsey, Montague Egg, others
Plot summary and comments: A collection of 12 short stories, four of them starring Peter Wimsey, six starring Montague Egg, and two others with no series character.
I've used many sources of information about authors and books. For generating the initial lists of works, I have relied heavily on Allan J. Hubin's Crime Fiction II: A Comprehensive Bibliography, 1749-1990 (New York: Garland, 1994), which can be found in many university libraries; it includes short story titles and film versions of stories. Other book details are taken from online library catalogs, particularly those of major universities, the Library of Congress, and the British Library.
Where I have used other reference sources for particular authors, these are mentioned on the author pages. Plot summaries are largely my own, with the exception of Agatha Christie's, for some of which I have adapted information from Charles Osborne's book, listed on her biography page.
The classic reference volume for mystery and detective fiction is Jacques Barzun and Wendell Taylor's A Catalogue of Crime (2nd ed., New York: Harper & Row, 1989), which gives capsule reviews of thousands of books in a very readable (and splendidly opinionated) style. For further online sources of information on and discussion about mystery novels in general, a good place to start is Michael Grost's Guide to Classic Mystery and Detection.