Marriage before Death: WWII Spy Thriller

After D-Day, her photograph appears on the most-wanted Nazi propaganda posters. Who is the girl with the red beret? She reminds him of Natasha, but no, that cannot be. Why does Rochelle step into his life when he is led by SS soldiers to the gallows? At the risk of being found out as a French Resistance fighter, what makes her propose marriage to a condemned man?