A film noir starring Deanna Durbin may seem as natural as eating an oyster with a splash of chocolate syrup, but if you're adventurous, well, somebody has to be the first to try it. Actually, the movie's a pleasant romp. Lady on a Train is a comedy mystery with some nice noir characteristics...shadows, trains, bodies and a climax in a darkened office building that would make Dick Powell feel right at home.

Nikki Collins (Durbin) is a society deb from San Francisco coming in on the train for a visit to New York. As the train pulls into Grand Central, she casually looks out the window of her compartment and sees an elderly gentleman in an office across the way having his head bashed in by a crowbar-wielding murderer. She can see the victim's face, but not the assailant's. There are two things we need to know about Nikki. First, she's an energetic, confident young woman who is as determined as they come. Second, she loves mysteries. In fact, she was reading Wayne Morgan's "The Case of the Headless Bride" when she looked out the window. She goes to the police but they don't take her seriously. Plus, it's a few days before Christmas and no one is looking for more work than they already have. What's an heiress to do? Nikki looks up Morgan's address and pesters and prods him into using his skills as a detective to help find the killer. Nikki isn't fazed when Morgan (David Bruce) tries to tell her he's an author, he's shy, he's faint-hearted and he's no detective. She's determined to enlist his help, but in the meantime she's learned who the victim is, a very rich man. And she learns not only where he lived, but that his family is saying the man died accidentally in a fall. So off she goes to the family mansion in the dead of night with snow starting to sift down...and just happens to be mistaken for Margo Martin, a singer at The Circus nightclub who was the "fiance" of the dead man. Wouldn't you know it, the old man's will leaves nothing to his two nephews, the eccentric and courtly Jonathan Waring (Ralph Bellamy) and the charming and untrustworthy Arnold Waring (Dan Duryea), but everything to Margo.

Nikki has to deal with Danny, the Waring's thug of a chauffeur, and Mr. Saunders, the cold- eyed proprietor of The Circus who always carries a large white cat cradled in one arm. She finds she has to keep impersonating Margo, even if it means she has to sing "Night and Day" and "Give Me a Little Kiss, Will You, Huh?" as part of Margo's act. Tailing after her, like a small tug in the wake of a cruiser, is Morgan. I think they're starting to be attracted to each other.

Up to now the movie has been amusing, light-weight and very much a vehicle for Deanna Durbin. She's no longer the little girl with a wonderful voice, as she was in the Thirties and Early Forties. She's a grown-up, and the studio is showing her off as a romantic lead who has a sense of humor. She's impeccably photographed, stylishly dressed and confident as all get out. It all pays off in the last 15 minutes when Nikki finds herself in the same office building where the killing took place. She's got both nephews looking for her, and one of them knows where the crowbar is hidden and intends to use it. There's the garage with the creaking car lift, the great storage floor where mounds of grain are piled, there are all the empty offices and hallways...and everything is dark and shadowed. Nikki keeps her cool, although she's quite happy when Morgan finally shows up to help save her. "Oh, darling," she tells him afterwards, as he faints, "you were wonderful." Could the movie end without a marriage? And we know Deanna Durbin has grown up when, just before we see "The End," there's a charming moment of sexual innuendo on the train taking Nikki and Morgan, newly married, to San Francisco.

Deanna Durbin never seemed to take herself too seriously; she was always ready for a pratfall in the mud or a joke at her expense. She may not have had Judy Garland's overwhelming charisma, but she came close for a lot of people. More importantly, she didn't have Garland's edgy sense of an impending neurotic breakdown. Durbin was the girl next door with a sunny disposition, a great sense of humor and with a bit of the tomboy about her. In 1948, when she was 27, she announced her retirement. She and her husband, who directed this film, moved to France, where she still lives. She has never shown any interest in her movie-making past. She has never made another movie, has refused all requests for interviews and photographs, and has devoted herself to living a sane life. Good for her.

The studio surrounded her in this film with some excellent character actors. In addition to Duryea and Bellamy, there's George Coulouris, Allen Jenkins, Edward Everett Horton, Samuel S. Hinds and William Frawley. And in a small role is Patricia Morrison, who three years later would be wowing the crowds singing "I Hate Men!" in Kiss Me Kate.