This is a beautifully made, written and directed movie. Paul Henreid (you may remember him from Now Voyager lighting the two cigarettes for himself and Bette Davis - or in Casablanca as the Czech resistance figure with Ingrid Bergman whom she is helping to escape the Continent to fight again) is very moving and believable as a French squadron leader based in England with the Free French forces.
Henreid always comes off well in European roles - he SEEMS foreign, very romantic in a rather exotic Continental manner.
He and four other fighter pilots based in England were clearing the way for the first British bombing raids on Germany, when they were shot down over France. They are trying to return to England via Paris (where Henreid's childhood teacher is now the dean of a cathedral and may help) - but only if they can contact British intelligence agents whom they must first identify and try to locate. Even with the help of the British intelligence and French secret agents, they must then evade the Gestapo that haunts Henreid's path through Paris.
Henreid meets and is harbored by Michelle Morgan playing the title character, and who only gradually comes to understand who Henreid is. The simplicity, modesty, and religious and romantic nature of her barmaid are shown so lovingly. She falls in love very quickly - yet this seems completely a part of this girl's makeup - throughout you sense the enormity of this one great thing in this girl of poverty who lives alone on the top floor, above the cafe, with her tiny shrine to Joan of Arc.
The sets are astonishing - one feels as if one really is in Paris and one of its great cathedrals, in its sewers, its steam baths, its cafes.
Henreid's attempts to lose the Gestapo agent (a "postage stamp" sticking to him) is suspenseful and imaginative - a wonderful game of cat and mouse throughout Paris to join his comrades.
The movie is extremely and wonderfully romantic - the discourse of the two lovers - one doomed - is terribly moving and painful. I rented this one week, and could not resist renting it again when I entered the store.
This is a wonderful and underrated movie.