In her last collaboration with director Oliver Assayas, “Clouds of Sils Maria,” Kristen Stewart’s character literally disappeared halfway through the movie.

While watching the pair’s next film, the haunting “Personal Shopper,” one half-expects her to vanish before our eyes in this movie, too.

“Personal Shopper” is a ghost story, elliptical and surprising, and it’s not always clear that Stewart isn’t the ghost. The film is out now in a new Blu-ray edition from the Criterion Collection.

Assayas says in an interview on the Criterion disc that he wanted to make a ghost story that was quintessentially French. That included the Paris setting, and references back to the 19th century, when Europeans would regularly hold seances and even craft crude portraits in which their deceased loved ones “appeared.” In “Personal Shopper,” the ghosts seem to be all around us.

Stewart plays Maureen Cartwright, an American living in Paris who works as a personal shopper to a wealthy celebrity philanthropist, Lara (Sigrid Bouaziz). Since Lara is too famous to go out in public, Maureen goes out and buys expensive clothes and jewelry for her. We hardly see Lara in the film, and she hardly sees Maureen, and each is an almost spectral presence in the life of the other.