It stars Marie Bäumer as famous actress Romy Schneider, with Birgit Minichmayr, Charly Hübner, Robert Gwisdek, and Denis Lavant in supporting roles.

He brings a journalist, Michael Jürgs [de], to whom Romy has agreed to give an in-depth interview for the German magazine Stern.

Their sessions take on the air of a Catholic confessional or a psychiatrist's consulting room, for Romy seems ready to be open and to put on record much about her life.

[14] Stephen Dalton of The Hollywood Reporter stated, "3 Days in Quiberon gives Bäumer ample room to play flighty, brittle, defiant, needy, haughty, seductive and fifty shades of vulnerable.

But a single knockout performance does not make a compelling film, and Atef's intimate psychodrama ultimately lacks the imaginative verve and narrative meat to fill its overlong running time.

"[15] Jay Weissberg of Variety opined, "Bäumer's uncanny resemblance and fine central performance anchor what is ultimately a predictable treatment of a tortured actress, nicely lensed in black and white, that will find resonance in countries where Schneider remains a much-beloved star.

[…] The only thing that really separates the film from standard Hallmark Channel-style biographies is Thomas Kiennast's elegant black-and-white cinematography and meticulous framing.

"[17] Peter Bradshaw of The Guardian gave the film 3 out of 5 stars, describing it as "a curious movie: ruminative, lugubrious and theatrical – intense at some moments; at others low-key and almost inconsequential.

"[18] Wendy Ide of The Observer gave the film 4 out of 5 stars, calling it "handsome, scrupulously well-crafted" and writing that "the camera brilliantly mirrors Schneider's mercurial moods.