Vivian Maier's name began appearing in news reports around 2010, a year after her death and three years after John Maloof bought a box of her street photographs at auction. He was just looking for pictures of Chicago history, but he discovered a devoted artist who shot at least a roll of film every day but never showed her work to anyone. Why? As the full weirdness of that central mystery unfurls in the gripping documentary Finding Vivian Maier
, the enigma that was Maier herself emerges. She was, in short, a shady lady. Even the directors seem startled by what they find on the trail of the peripatetic nanny behind the Rolleiflex.