I'm looking for the name of a story I read a while back. It was about a captain of a spaceship that rescues a young woman who is royalty (I can't remember what level of royalty). The earth at the time is divided into two empires or nations. One is based in Brazil (her empire) and the other England. The woman's spaceship is attacked and there is a running battle and some other action that I can't remember too well. When the captain finally returns the woman to earth it's revealed that he is a prince of the other empire in England.
Now here's the kicker, I'm not sure if I read this story on this website or another one. Please help if you can.