Comic Title: Batman #168
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: December 1964
On Sale Date: October 15, 1964 Copyright Date October 15, 1964
Source: Library of Congress, Periodicals 1964

Frequency: Monthly, with the exception of Jan., April, July and Oct.
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "How to Solve a Perfect Crime -- in Reverse"
Pages: 12

Feature(s):
Batman (of Earth-1)

Writer: France E. Herron
Penciller: Sheldon Moldoff
Inker: Joe Giella

Reprinted In:
Batman:The Dynamic Duo Archives Vol. 2 HC (2006)
Showcase Presents Batman Vol. 1 TPB (2006)

Feature Character(s)

• Batman (last appearance in Batman #168; next appearance in Justice League of America #32)

Supporting Character(s)

• Robin (last appearance in Batman #168; next appearance in World's Finest Comics #146)
• Commissioner Gordon (last appearance in Batman #168; next appearance in Batman #169)
• The Mystery Analysts of Gotham City (last appearance in Batman #164; next appearance in Batman #174)
• Martin Tellman (last appearance in Batman #164; next appearance in Batman #174)
• Art Saddows (last appearance in Batman #164; next appearance in Batman #174)
• Kaye Daye (last appearance in Batman #164; next appearance in Batman #174)
• District Attorney Danton (name revealed; last appearance in Batman #164; next appearance in Batman #174)

Villain(s)

• Ralph Vern (alias Mr. X; last appearance in Batman #164; no further appearances)
• A gang of gold smugglers (no further appearances)

Other Character(s)

• Mr. Mergen (a jeweler; no further appearances)

Comments:
This is a Mystery Analysts of Gotham City story.

Synopsis:
At a meeting of the Mystery Analysts, the group finds a tape recording left by one of its members. The recording reveals that a perfect crime was committed by a member of the group, the theft of a rare diamond.

The Analysts split up to investigate the crime perpetrated by one of its own. When they meet again, Batman records their verbal reports and compares it to their written ones. He determines that Prof. Ralph Vern must be the crook. Batman then backtracks Vern's past and finds how he accomplished the theft. He then proves it to everyone, and Vern is arrested.