Formed in the late 1980s by a group of writers who wanted a forum for exchanging ideas. Includes membership information, book list and information about members.

Professional body which sets out to represent writers of crime fiction and non-fiction. Features author profiles and membership information.

Reading group that focuses on mystery, thriller and horror novels. List of monthly book selections, news, and information about author chats.

Sponsors symposia and mystery conferences, presents the Edgar Awards and provides information for mystery writers. Site includes membership details, bylaws, information about regional chapters, and links to author websites.

Group that promotes the reading and writing of suspense and mystery fiction with strong romantic elements. Includes newsletter excerpt, membership details, member directory, and list of new releases.

Indianapolis-based mystery fan club with world-wide membership. Includes articles, reviews and discussion.

National association for professional practitioners of the crime writing genre in Canada. Offers news and information about members and their books.

An online society for readers and writers of mystery fiction in the short form.

Group which discusses and promote Sherlock Holmes and other literary works of Sir Arthur Conan Doyle. Based in Calgary, Alberta.

Promotes the enjoyment of detective literature, and named after Ruth Dudley Edwards' heroine. Based in London and Cambridge, Great Britain. Event details, membership information, and list of committee members are available.