This book consists of several mini stories of unsolved murders and crimes. A group of people each try to solve the mysteries and the person who told the story reveals the true solution.
The thirteen problems

Agatha Christie: The thirteen problems (1932, Published for the Crime Club Ltd. by W. Collins Sons & Co.)
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250 pages
English language
Published Nov. 17, 1932 by Published for the Crime Club Ltd. by W. Collins Sons & Co..