Comic Title: Detective Comics #351
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: May 1966
On Sale Date: March 29, 1966 Newsstand Date March 29, 1966
Source: Direct Currents, Sea Devils #29, Page 11

Copyright Date March 29, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "The Cluemaster's Topsy-Turvy Crimes"
Pages: 14

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

Writer: Gardner F. Fox
Penciller: Carmine Infantino
Inker: Sid Greene

Reprinted In:
Batman Family #2 (1975)
Showcase Presents:Batman Vol. 2 TPB (2007)
Tales of the Batman:Carmine Infantino HC (2014)

Feature Character(s)

• Batman (last appearance in Teen Titans #3; next appearance in Batman #181)

Supporting Character(s)

• Robin (last appearance in Teen Titans #3; next appearance in Batman #181)
• Harriet Cooper (last appearance in Batman #175; next appearance in Batman #184)

Villain(s)

• Cluemaster (next appearance in Batman #201)
• Cluemaster's gang (no further appearances)

Synopsis:
Aunt Harriet accidentally discovers the secret entrance to the Bat-Cave. Bruce and Dick try to cover their tracks and make Harriet believe that she was mistaken. Harriet tries to foil their plan by gathering more evidence.

While matching wits with Harriet at home, Batman and Robin are also involved on a case against the criminal called the Cluemaster. Unknown to the Caped Crusaders, Cluemaster is also trying to uncover Batman's secret identity. Batman's efforts to fool Harriet also help to keep Cluemaster off track.

Bruce finally convinces Harriet by creating a trick film showing Batman and Robin meet him and Dick. Batman also captures Cluemaster and keeps him from discovering his secret.