Rebecca Zlotowski’s latest, in theaters Friday, is part noir, part comedy of remarriage, and part Freudian fever dream about past lives.

This is a film that does not abide by rules or play into any easy expectations about what it should be, resulting in big swings, tonal shifts and even a lurking Holocaust through-line. Also, oddly enough considering such grave themes and subjects, it’s all done with a relatively light touch set, in part, by the cheeky needle drop at its opening: the Talking Heads song “Psycho Killer.” Some parts work better than others, but you can’t help but admire the go-for-broke originality and unabashed femininity of it all. And anchoring it all is Foster, using the full force of her star power and impeccable French to make “A Private Life,” unwieldy and complex as it is, go down as easy as a glass of gamay.

Foster’s character, Dr. Lilian Steiner, is an American expat living and working in France. She’s an accomplished, sophisticated woman who believes she has a grasp on people and the world around her, recording and cataloging all her private sessions with clients on meticulously organized CDs. This act in and of itself is a little odd — her son wonders why she doesn’t just use a more modern method, for instance. But it also kind of gets to the heart of why, perhaps, despite her evident intelligence, there’s a cold disconnect between analyst and subject. Is she even listening to them?

Lilian starts to wonder this herself after she receives a call that her client Paula has died by suicide. Paula was not someone she believed was capable of this. Instead of looking inward, she goes back to the tapes to begin an amateur investigation to find some other explanation: It must be murder, she concludes. Suspects include Paula’s daughter Valérie and husband Simon .

She also enlists a sidekick in her sleuthing, her ex-husband Gabriel who is more than happy to go along for the ride, to listen to her conspiracy theories over several bottles of wine, to be a decoy distraction so that she can snoop through Simon’s house, and, ultimately, to just be there for her, no matter how unhinged she’s becoming. You can just see the love and admiration in his attentiveness. He’s not off put by the crazy; it’s just part of what makes her, well, her. Their rekindled relationship, so effortlessly lived in, so mature, so fun, is by far the highlight of “A Private Life.”

It’s a shame that their romance is basically a side show to the more convoluted rest, which involves a hypnotist and a revelation of a past life in which Lilian and Paula were members of the same WWII-era orchestra and lovers torn apart by jealous exes and Nazis. One of those Nazis is Lilian’s son , which she awkwardly, drunkenly tells him at his birthday dinner to try to explain why they’ve never been that close. She’s also completely disinterested in her grandchild, which might be one “let’s unpack that” too many in this film. In other words, there’s a lot going on in “A Private Life,” which Zlotowski co-wrote with Anne Berest.

One thing there’s not enough of is Efira. She gets some moments in flashback, but most of them teeter on the “dead wife montage” cliche. It’s not that Zlotowski wasn’t aware of what she had in Efira , but perhaps she was counting on our familiarity to fill in the gaps.

“A Private Life” is ultimately Foster’s show anyway and she seems to relish the tricky assignment. The tone around her might be on the lighter side, but for Lilian, the stakes are grave with the very essence of her self-worth and life’s work on the line. It’s a fascinating portrait of a woman essentially forced to rethink and revise all of the rules she’d lived by, the facts that she made sense of the world with and submit herself to the idea that some things might just be unknowable — even for a know-it-all psychoanalyst.

“A Private Life,” a Sony Pictures Classics release in theaters Friday, is rated R by the Motion Picture Association for “language, graphic nudity, brief violence, some sexual content.” Running time: 105 minutes. Three stars out of four.

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