Comic Title: Detective Comics #340
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: June 1965
On Sale Date: April 29, 1965 Newsstand Date April 29, 1965
Source: House Ad, Batman #172, Page 6

Copyright Date April 29, 1965
Source: Library of Congress, Periodicals 1965

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

Title: "Mystery of the Millionaire Cowboy"
Pages: 10

Feature(s):
Elongated Man (of Earth-1)

Writer: John Broome
Penciller: Carmine Infantino
Inker: Sid Greene

Reprinted In:
Showcase Presents the Elongated Man Vol. 1 TPB (2006)

Feature Character(s)

• Elongated Man (last appearance in Detective Comics #339; next appearance in Detective Comics #341)

Supporting Character(s)

• Sue Dibny (last appearance in Detective Comics #339; next appearance in Detective Comics #341)

Villain(s)

• Three gangsters (Charley named; no further appearances)

Other Character(s)

• Amos Hurd and Betsy (a millionaire and his wife; no further appearances)

Synopsis:
Ralph and Sue have two tickets for a sold-out hit stage show. When they get to the theatre, they discover that no one is in the audience except them. As the show begins, they hear applause for the non-existent audience. Ralph is puzzled and begins investigating as the Elongated Man.

Ralph checks the box office and learns that an eccentric millionaire has purchased all the seats in the theatre. Ralph visits the man's home and finds him at the mercy of a gang of criminals. Ralph apprehends the crooks, then learns that the millionaire bought all the seats for a private anniversary show for his wife. The applause was recorded for the benefit of the actors. Ralph, Sue, and the millionaire couple then attend a private viewing of the entire show.