Hanover Street is one of those old fashioned wartime romances so popular on both sides of the pond during and after World War II. At a time when a lot of people and nations united to defeat a generally recognized menace to civilization folks were in a sacrificing mood.
American flier Harrison Ford and British army nurse Lesley Anne Down meet on Hanover Street and the chemistry is high voltage electric. Soon they are in an affair, but Down doesn't tell Ford she's already slightly married to Christopher Plummer.
Plummer is in British Intelligence, a researcher and a trainer, but yearns for some field action feeling that Down might see him in a better life as he has suspicions that she's drifting away. Wouldn't you know it he takes on a field mission that involves him pretending to be an S.S. officer and he's to go to some S.S. headquarters in occupied France and steal some vital plans. This is the kind of plot that was popular during World War II years. The most famous were those sought after 'letters of transit' in Casablanca.
That field mission puts him on Harrison Ford's bomber and when it's hit both have to bail out and Ford becomes part of the mission.
Hanover Street is so old fashioned though Ford seems to borrow a bit of Han Solo from the future in his portrayal of the flier that it really belongs in the Forties. Only that Ford and Down are actually shown if discreetly having a sexual relationship that the Code would never permit you would swear this was a Forties film. In fact think Casablanca if want to know how this ends.
If you like romances, Hanover Street is for you.