Louis I. Kahn ranks among America’s greatest architects, but his refusal to compromise left many unfulfilled projects when he died of a heart attack in the gents at New York’s Penn station in 1974. Not only did he leave debts of half a million dollars, but his body lay unclaimed for two days because he’d scratched out the address on his passport. Curiously, his son Nathaniel, this film’s director and narrator, wasn’t even listed among the family members in the obituaries, a puzzling omission explained by the fact that in addition to his ‘official’ family, Kahn had also fathered illegitimate children by two other women. In part, Nathaniel Kahn’s film sets out to answer whether his father’s evident cultural stature could excuse or even explain such destructive behaviour. Putting together biographical details and visiting his buildings starts to put things into perspective, but it’s his extended family’s bittersweet experiences which make this far richer than a mere arts profile.