Director Nathaniel Kahn barely knew his father, but many throughout the world did. He was renowned architect Louis Kahn, who designed noteworthy buildings in California, Texas and even Bangladesh. Nathaniel explores his father's past, interviewing architects such as Frank O. Gehry, as well as members of the multiple families started by the philandering Louis. What emerges is a portrait of a brilliant but unreliable man whose creations, featured prominently in the film, still astound.