

William Holden is thirty year old architect Donald Gresham who meets a young woman, Patty O’Neill(Maggie McNamara in her first screen role), on the observation deck of the Empire State building. She’s twenty-two and he’d spotted her in the lobby, following her up after seeing her look at a tube of lipstick and put it down. He purchases it and manages an introduction where he gives it to her. He learns he’d been watched also, wondering at his purchases, pumice stone and rubber bands.
A loose button on his suit jacket comes off and she offers to sew it back on, having a needle and thread in her purse. Gresham manages to lose the needle and thread, tucked 

At his apartment building, the elevator door opens and there is the woman in the picture, who angrily closes the doors and goes back up. In his apartment, there sits another framed picture like the one in his office and the word stinker in lipstick on a mirror. The story comes out then. Cynthia Slater(Dawn Adams) is his now ex-fiancee following an argument last night. She lives upstairs with her father David(David Niven). The blowup apparently was caused after he dropped er off after dinner and a show, she comes downstairs after finding her father entertaining a young woman and is offended that he sleeps on the couch while she takes his bed.
When Niven arrives while Gresham is out to buy food so that Patty could cook their dinner, it had started to rain quite heavily, she takes to him quite easily and he’s taken 
They talk while she prepares dinner, the fastest meal on Earth. In about five minutes screen time, she brings in three steaks, coffee, and salad.
From this point on, we’re subjected to a series of incidents reminiscent of the finest sitcom(but since it was this early in the TV era, possibly they all took cues from this movie. Niven slings ketchup on Patty’s dress, the ex-fiancee comes down the fire escape in pouring rain to see her taking her dress off in Gresham’s bedroom, she returning to her room for a hot bath, then calling Gresham threatening suicide(not really, just to get him out of the apartment), then managing to leave the spigot on the tub running when she leaves to meet Gresham. David and Patty left in the apartment when they see water dripping from the ceiling. There he ends up proposing to her, gives her money, no strings attached, then Gresham shows up looking for them just i time to catch her kissing Niven.

Of course, as in all romantic comedies, things work out in the end.
A few observations:
A different time I assume. Such a naive young woman getting into these predicaments might not happen today, who knows. Like as not she would end up dead being so friendly so
The word virgin was thrown around quite a lot in the film, in one instance Patty was called a “professional virgin” by the ex-fiancee. When asked why Gresham explained “that a girl who advertises it as much as she did had something to sell.”
The movie was rather talky, not straying far from it’s stage roots. Wasn’t bad, but now that I’ve seen it, no desire to again.
For more overlooked movies, go check out Todd over at Sweet Freedom.