Comic Title: Detective Comics #309
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1962
On Sale Date: September 27, 1962 Copyright Date September 27, 1962
Source: Library of Congress, Periodicals 1962

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Jack Schiff

Title: "The Mystery of the Mardi Gras Murders"
Pages: 13

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

Penciller: Sheldon Moldoff
Inker: Charles Paris

Feature Character(s)

• Batman (last appearance in Justice League of America #15; next appearance in World's Finest Comics #129)

Supporting Character(s)

• Robin (last appearance in Batman #151; next appearance in World's Finest Comics #129)
• Batwoman (last appearance in Detective Comics #307; next appearance in Detective Comics #311)
• Vicki Vale (last appearance in Batman #119; next appearance in Batman #155)

Villain(s)

• Mike Kelso (an escaped convict; dies in this story; no further appearances)
• Kelso's cell-mate (no further appearances)
• J.J. Ashley and various henchmen (no further appearances)
• Ed Burton (Ashley's assistant; dies in this story; no further appearances)
• Weeper Willow (a petty crook; no further appearances)

Other Character(s)

• Tom Dawes (a festival assistant; no further appearances)

Synopsis:
Mike Kelso, a convict, escapes from jail and attends the Gotham City Mardi Gras. Batman trails him there, but finds him murdered. The Caped Crusader attempts to find the killer, and with the help of a Vicki Vale photograph, learns what costume the man is wearing. The man flees, but he himself is killed, and is apparently not Kelso’s murderer.

Batman investigates further and uncovers a smuggling ring operating inside the traveling festival. He finds the stolen loot, and the killer finds him. Batman is triumphant and reveals the identity of the killer as J.J. Ashley, the festival promoter.