Elliot Carr is an agent with IMPACt.
That is the International and Metropolitan Police Air Control, an organization I am told* is "geared to protecting airlines around the world". With international air travel becoming almost ubiquitous in the late 50s and on into the 60s, I can understand wanting to have a policing team able to operate anywhere in the world where commercial airplanes go with the authority to arrest malefactors who threaten that industry, but the first part of the name "International and Metropolitan" has be confused.
From the blurb for both of the recorded adventures, we learn that Carr is a "world trouble shooter" which definitely fits the International aspect of his employer's name. Likely based out of Sydney he is able to fly, courtesy of any airline, to wherever there are problems of a criminal nature affecting the skyways.
His pictures show him to be likely in his middle 30s with shortish brown hair and an athletic build. He is shown in both cases to be dressed in a suit, fairly common for that days, with a pistol in his right hand ready for instant use.
Not meaning to nitpick on these adventures but ... in the second one, the cover clearly talks about Carr being involved with "espionage - and a wanton woman". My dictionary defines wanton as "sexually unrestrained" but the picture shown clearly has the woman gagged with her hand tied behind her back - that seems restrained to me!
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* All that I know about this agent other than from the covers is courtesy of the website . When I learn more, I will amend this page.