‘Cuckoo’: Hunter Schafer Goes Nuts in the Deranged New Thriller

With a title like Cuckoo, out-there insanity is a must, and Tilman Singer’s sophomore feature mostly lives up to the bar it sets for itself. Energized by superb performances from Hunter Schafer and Dan Stevens, this gonzo body-horror thriller—in theaters Aug. 2—is a bewildering and gripping saga about reproduction, identity, and family that, at its finest, taps into a legitimately demented vein.

On a trip to a Bavarian...