The Nine Wrong Answers, first published in 1952, is a detective story by John Dickson Carr which does not feature any of Carr's series detectives. This novel is a whodunnit mystery, with an emphasis on the puzzle aspect. The title derives from Carr's atypical use of footnotes to address the reader, remarking on …
The Problem of the Wire Cage, first published in 1939, is a detective story by John Dickson Carr featuring his series detective Gideon Fell. This novel is a mystery of the type known as a locked room mystery.
The Sleeping Sphinx, first published in 1947, is a detective story by John Dickson Carr which features Carr's series detective Gideon Fell. This novel is a mystery of the type known as a whodunnit.