Kara Vania is a freelance agent.
There are only three recorded adventures known about this interesting spy-for-hire but indications are that, while her other adventures may have not gotten pen put to them, they were many and varied for her name is said to be known to the various intelligence agencies around the world.
In Robert Sampson's impressive Deadly Excitements: Shadows & Phantoms, a book that "celebrates yesterday's pulp magazine and their heroes and heroines", she is listed as a woman of many sobriquets such as the Lady of Doom, the Tiger Woman, and the World's Most Glamorous Spy".
This red-haired beauty is said by one anonymous source from Geocities to be a "freelance espionage agent and adventuress, who works on a global level for whoever will hire her". I believe this source was citing Sampson's work as well for both mention Vania's mission to retrieve stolen papers while evading Soviet agents in an escapade that takes her from London, where she finds herself thrown into the Old Bailey, all the way to Shanghai. Sampson states that she "loses her clothing twice more, is sold as a slave to an opium house, escapes from there dressed as a Russian officer". She finally succeeds in her mission but "loses all her clothing and arrives as naked as only a sensuous spy can get who has ripped it all off to dazzle the enemy's mind".