Her shaggy, '70s-set film starring Josh O'Connor as the orchestrator of an art museum robbery gone wrong, channels the kind of shaggy '70s capers that defined the genre - without any of the sleek, satisfying results of a heist flick. Instead, The Mastermind feels more true to the sinuous core of '70s neo-noir like Robert Altman's The Long Goodbye: meandering, pensive, and melancholy.