Death and secrets permeate writer-director Rungano Nyoni’s dazzling second feature, the winner of Best Director in the Un Certain Regard sidebar at the Cannes Film Festival. Driving through the night after a party, Shula (Susan Chardy) happens across the corpse of her Uncle Fred. That he’s dead isn’t shocking—that she doesn’t care at all is. A portrait of Zambia’s matriarchal society and the lingering emotional scars left behind by sexual abuse, On Becoming a Guinea Fowl combines dark comedy and bruising drama—absurdism and stripped-down realism—to investigate lies that have smothered Shula’s family for years. The filmmaker of 2017’s equally stellar I Am Not a Witch continues to demonstrate an ability to craft modern parables that grapple with both history and a younger generation’s desire to break free from the sins of the past.