Comic Title: Detective Comics #247
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: September 1957
Approx. On Sale Date: July 23, 1957 Copyright Date July 21, 1957
Source: Library of Congress, Periodicals 1957
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 Impossible Messages"
Pages: 6

Feature(s):
Martian Manhunter (of Earth-1)

Artist: Joe Certa

Reprinted In:
Showcase Presents:Martian Manhunter Vol. 1 TPB (2007)

Feature Character(s)

• Martian Manhunter (last appearance in Detective Comics #246; next appearance in Detective Comics #248)

Supporting Character(s)

• Captain Harding (last appearance in Detective Comics #246; next appearance in Detective Comics #250)

Villain(s)

• Members of a smuggling ring (no further appearances)

Other Character(s)

• An undercover police agent and a fireworks factory manager (no further appearances)

Synopsis:
John Jones investigates a smuggling ring that is able to outwit harbor patrols. He determines that the crooks are using a unique signal involving fireworks. John attempts to disrupt their signal, but the crooks use fire against him. John manages to get away, then alters their signal. With the signal changed, the smugglers are caught by the police.