Josh O'Connor plays a family man whose under-planned theft from a local art museum goes amusingly awry in Kelly Reichardt's inspired "The Mastermind"

Josh O'Connor plays a hapless art thief whose big job goes wrong in the 1970s-set thriller, which premieres in the Cannes competition on Friday.

Cannes: Reichardt's purest genre exercise since 2013's "Night Moves" retains her patient bent toward long, lonely takes while also delivering on a few sophisticated heisty thrills.