Sherlock Holmes Handbook sums up a Canadian scholar's lifetime expertise about Sherlock Holmes – the characters and themes, the publishers and readers, Victorian London and the Houdini connection, radio actors and cartoonists, the fans who cling to Holmes's reality and the professors who tease out motifs from the fifty-six short stories and four novels.

The first edition of Sherlock Holmes Handbook appeared in 1993. This edition catches up on new films, new books (a few with a hint of the supernatural) and the advent of the Internet, which has spread Holmes's fame and Sherlockian fun even further worldwide. The intervening years have brought three multi-volume editions of the Sherlock Holmes stories, with hundreds of footnotes providing new insights and new amusement. They have also seen Holmes repeatedly on the amateur and professional stages, including a few Canadian productions. And there have been changes to everything from copyright rules to libraries, booksellers and audio recordings.