Passing is Rebecca Hall’s adaptation of the Nella Larsen novella (1929) about two biracial women, one of whom chooses to pass for white, and one who does not, and the effect they have on each other, and it’s superbly done. It’s tightly made, exquisite to look at, strangely tense, wholly riveting and it’s also, let’s be honest, just the right length for a film (90 minutes).