vivian_maeirMonday, May 5

Finding Vivian Maier attempts to unravel the mystery of an unassuming nanny whose secret passion for street photography was accidentally discovered and widely celebrated in the art world after her death. Screens May 2 through May 8 at Nickelodeon Cinemas (1 Temple St., Portland); today at 12:15 p.m., 2:30 p.m., 4:30 p.m., 7 p.m. and 9:45 p.m. Tix: $6.50-$8.50. 772-9751. space538.org.