"The Crimson Avenger"
*On Sunday, October 1938, newspaper publisher Lee Travis, who inherited the New York Globe-Leader from his late godfather Winston Smythe not to many months ago, dons crimson mask and cloak to attend a party given by the Vangilders for the cause of Chinese War Relief. He's driven there by his new chauffeur, Wing; and there he encounters another guest named Claudia Baker, who's interviewed him with considerably sarcasm that very day for a magazine. But October 30 turns out to be the same day that a young genius named Orson Welles broadcasts a radio "Invasion from Mars" which panics a goodly portion of a tense nation... and some pre-warned criminals use this as an excuse to rob the Vangilders' party, disguised as gun-wielding "Martians". In an ensuing scuffle, Claudia Barker is shot; she dies in Lee Travis' arms, gasping a Latin phrase: "Qui vindicet ibit" (the avenger will come). Travis, still in his costume, gives chase and, aided by Wing and a New Jersey farmer with a shotgun, brings down the murderers. On a whim, Travis elects not to stick around till the police arrive, but to let them think a "Crimson Avenger" has done their work for them.* Source: DCGuide.com
Also includes a cover reprint of Detective Comics #22.