The Black Spectacles

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The Black Spectacles

First UK edition cover
Author	John Dickson Carr
Original title	US title: "The Problem of the Green Capsule: being the psychologist's murder case"
Language	English
Series	Gideon Fell
Genre	Mystery, Detective novel
Publisher	Hamish Hamilton (UK) & Harper (USA)
Publication date	1939
Publication place	United Kingdom
Media type	Print (Hardback & Paperback)
Pages	223 pp (International Polygonics paperback edition, 1986)
ISBN	0-930330-51-X (International Polygonics paperback edition, 1986)
OCLC	15209355
Preceded by	The Crooked Hinge (1938)
Followed by	The Problem of the Wire Cage (1939)

The Black Spectacles (published in the US as The Problem of the Green Capsule, with the subtitle "Being the psychologist's murder case"), 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 (or more properly a subset of the locked room mystery called an "impossible crime" story).