I’ve posted about Vivian Maier before, but if you need a refresher, here’s the low-down: She was a former nanny with an extreme secret passion for photography. Her photos were picked up at an estate sale by a man named John Maloof who found her images so stunning that he began scanning them and showing them off. She is now considered the 20th century’s most famous unknown photographer (although now she’s become quite famous in death).

Now, John is putting together this documentary about her life called Finding Vivian Maier. This is the trailer.