For 40 years, Vivian Maier was a nanny who took a lot of pictures. But she never exhibited her photographs. Why? After her death in 2009, archivist John Maloof bought at auction several boxes of her negatives, and soon recognized an undiscovered, major American talent.

This riddle of a documentary shows us her astounding work, but also tries to define her, revealing details so gradually that it plays more like a mystery. The film does not shrink from the troubling, impossible-to-answer question of what the reclusive Vivian would have thought of this well-deserved, posthumous fame. Unique and fascinating. Japanese title: Vivian Maier wo Sagashite. (83 min)