Opening Night Gala. A chance discovery in a Chicago thrift auction house would bring to light one of the 20th century’s greatest photographers – and would change the life of the man who took a chance on an unseen box of negatives. Vivian Maier – mysterious nanny, secret street photographer of 60s Chicago and hoarder of hundreds of thousands of negatives, undeveloped colour film, home movies, papers, letters and personal effects. John Maloof unearthed the treasure and leads us through a captivating detective story as he reconstructs her archive. Maier’s strange and riveting life and art are revealed through never before seen photographs, films, and interviews with dozens who thought they knew her.