Comic Title: Batman #23
Publisher: DC (Detective Comics, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: Jun/Jul 1944
Approx. On Sale Date: April 12, 1944 Copyright Date April 9, 1944
Source: Library of Congress, Periodicals 1944
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: Bi-monthly
Cover Price: $0.10
Page Count: 48
Editor: Jack Schiff

Title: "The Upside Down Crimes"
Pages: 13

Feature(s):
Batman (of Earth-2)

Writer: Bill Finger
Penciller: Dick Sprang
Inker: Gene McDonald

Reprinted In:
Batman:The Dark Knight Archives Vol. 6 HC (2010)
Batman:The Golden Age Omnibus Vol. 3 HC (2017)
Batman:The Golden Age Vol. 6 TPB (2020)

Feature Character(s)

• Batman (last appearance in Detective Comics #87; next appearance in Batman #23)

Supporting Character(s)

• Robin (last appearance in Detective Comics #87; next appearance in Batman #23)
• Commissioner Gordon (last appearance in Detective Comics #86; next appearance in Batman #24)

Villain(s)

• Joker (last appearance in Detective Comics #85; next appearance in Detective Comics #91)
• Joker's men (Snipes named; no further appearances)

Other Character(s)

• Prince Rageel, Mrs. Van Sneed, Nan Winslow, and Miss Latham (robbery victims; no further appearances)

Synopsis:
Inspired by a visit to a funhouse, the Joker begins a series of upside down crimes. He steals a priceless gem from Prince Rageel, capturing Batman and stealing the Bat-plane in the process. Batman is placed in a trap, but he turns the tables on the Joker. He leaves the crook for the police, then returns the stolen gem.

Joker escapes before the police arrive and continues his upside down crimes. Batman deciphers the clues which lead to a party where guests are costumed as movie stars. Joker's gang strikes, but Batman breaks up the robbery, apprehending the Joker again.