Comic Title: Detective Comics #229
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: March 1956
Approx. On Sale Date: January 26, 1956 Copyright Date January 24, 1956
Source: Library of Congress, Periodicals 1956
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Jack Schiff

Title: "The 10,000 Secrets of Batman"
Pages: 12

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

Penciller: Dick Sprang
Inker: Charles Paris

Reprinted In:
Batman Annual #1 (1961)
Giant Batman Annual #1 (1999)
Batman Annuals Vol. 1 HC (2009)

Feature Character(s)

• Batman (last appearance in Batman #98; next appearance in World's Finest Comics #81)

Supporting Character(s)

• Robin (last appearance in Batman #98; next appearance in World's Finest Comics #81)
• Commissioner Gordon (last appearance in Batman #97; next appearance in Batman #99)

Villain(s)

• John Creeden and his gang (no further appearances)
• Mart Mathers (a thief; no further appearances)

Other Character(s)

• John Waller (a TV show host; no further appearances)
• Morrell, Varnor, and Birely (technicians; no further appearances)
• Ross Randall (a big game hunter; no further appearances)

Synopsis:
Batman brings the crew of a TV show into the Bat-Cave to do a feature story. One of the technicians steals Batman’s crime file and sells it to crooks. Batman tracks down the thief, then follows him to the other crooks.

Batman tries to take the files back, but the crooks trap him. He manages to escape, then summons Robin. Using a copy of the crime file, the heroes deduce the location of the crook’s next crime. They prevent the robbery, capture the crooks, and retrieve the files.