Hedy Lamarr was a technical genius who invented (and held the patent for) the technology underneath wifi, among other things.
Now, imagine a world where she got bored in Hollywood, in an era where women were nothing more than pretty show-pieces. British Intelligence had tried to recruit her. She declined, but kept their business card.
One day, she called them up, and joined the war effort.
Welcome to a fast-paced Dieselpunk world where no science is too mad, no adventure too grand, and no mission too dangerous.