The problem of the green capsule
Subtitle: being the psychologists' murder case
By: by John Dickson Carr
Edition: Bantam ed.
Publisher: Bantam Books
Published: 1947
Place of publication: New York
Language: eng
Number of pages: 245
Other titles: Green capsule.
Notes: Published in England as The black spectacles.

"Complete and unabridged"--Cover.

On cover: A Dr. Gideon Fell mystery.