Along with Jesse Eisenberg’s “A Real Pain,” scheduled for release this fall, Julia von Heinz’s “Treasure” is one of at least two dramas this year to follow the American descendants of Holocaust survivors on travels across Poland. Von Heinz’s film is based on a novel by the Australia-raised author Lily Brett, herself the daughter of survivors. But whatever complexities might come across in the book don’t register in a film that has been fashioned, sometimes uneasily, into a sentimental father-daughter road movie.

It is 1991, and Ruth (Lena Dunham, asked to do the most serious acting of her career), a journalist, has planned a trip to Poland. Her father, Edek (Stephen Fry), who, along with Ruth’s mother, survived Auschwitz, has insisted on joining her. He says he couldn’t let his daughter visit Poland alone.

Initially, “Treasure” presents Edek as a goofy lug, jocular and uninhibited. But his carefree attitude masks repressed trauma, to an extent that Fry never manages to make visceral. Unnerved by train travel, Edek hires a driver (Zbigniew Zamachowski, from Krzysztof Kieslowski’s “White”) to take them from site to site. “Treasure” builds to their trip to Auschwitz, where Edek quickly takes over from the tour guide with an outpouring of memories.

The crux of the film involves their visits to the Lodz apartment from which Edek and his family were exiled in 1940. Ruth wants to reclaim what was stolen from her family; Edek has a learned fear of not moving on from the past. Their difference in outlooks is a potentially powerful subject, but miscasting has blunted its impact.

Treasure
Rated R. Intense descriptions of survival in Auschwitz. Running time: 1 hour 52 minutes. In theaters.