During WWII, American pilot Jeff Eliot (Gene Kelly) was shot down over Germany and hidden by a German family. Since then, he's been sending packages regularly to them. After all, post-war Germany is a mess, food is severely rationed and poverty is everywhere. Now, several years later Captain Eliot is returning to Germany during his Christmas break to renew old times with the family. However, he soon learns the family was burned out in a bombing raid and another family has been pilfering the packages and saying nothing.
A bit later, he recognizes the daughter, Willie (Pier Angeli) in a cheap cantina and they renew old times. However, oddly, he never mentions these care packages when she treats him like an ungrateful American. I have no idea why this was done this way. Regardless, they eventually decide to spend the holiday, in part, in Salzburg and he doesn't realize that she works for scum-bags from 'Silhouette'...a group of ex-Nazis working evil in post-war Germany. When the American military bring this to his attention, Eliot is a bit dippy and doesn't believe his sweet fraulein could be in league with these people...and does she even know who they are?
This is a decent espionage film shot on location in Germany and Austria. The scenes are quite nice and add a lot to the authenticity of the movie. My only quibble is that it seemed very odd that they cast Ms. Angeli in the lead, as she's Italian, not German.