Exciting Comics #51, Miss Masque was another of the line of rich socialites-turned-masked crimefighters in the Golden Age which included The Shadow, The Batman, and The Green Hornet!
Diana Adams had no superpowers or abilities, just her keen deductive mind and a pair of .45 automatics. And, unlike her male contemporaries, she didn't have a sidekick or aides!
Clad in bright red cape, mini-dress, gloves, and slouch hat, she pursued criminals and saboteurs thru several issues of Exciting Comics, appearing on the cover only once (#53) during her run, before transferring over to America's Best Comics, where she teamed up (on the covers) with other heroes, most notably The Black Terror, even though they didn't appear together inside the comic! (They all had seperate strips!)
When superheroes faded away after the end of World War II, so did Miss Masque.
Since the 1990s, she's been revived by several publishers, most notably, by writer Alan Moore (of Watchmen fame) in DC Comics' America's Best Comics imprint (ironic, eh?), and artist Alex Ross in Dynamite Entertainment's Project SuperPowers series as well as a mini-series under her new code-name of Masquerade!
In this revival, she's part of a trio of psychically-linked, red-garbed superheroines (including The Woman in Red and Lady Satan) called The Scarlet Sisters!
We at Atomic Kommie Comics™ have also "revived" Miss Masque / Masquerade by digitally-restoring and remastering several of her best Golden Age cover appearances (including her first) on a line of t-shirts, mugs, and even calendars as part of our Lost Heroes of the Golden Age of Comics™ line of kool kollectibles!
She was a woman ahead of her time...but her time has finally come!
PS: Pick up the Project SuperPowers and Masquerade comics! They're the best Golden Age revival books out there!