What We’re Reading: ‘Developed’ wants to be the definitive story behind mysterious photographer Vivian Maier. But mystery unsolved.

I’ve been reading this new biography of Vivian Maier.

“Vivian Maier Developed: The Untold Story of the Photographer Nanny” (Atria, $40), by Ann Marks, a researcher and former chief marketing officer for the Wall Street Journal, bills itself as the definitive biography at last, as the whole deal in one book, the mysterious background, the 2007 discovery of a treasure trove of negatives, the story of how Maier spent decades trawling New York City and Chicago as a street photographer of unheralded talent. That epic, it’s here. And yet, that mystery grows unremarkable, and despite oodles of research and