Meticulously acted, gorgeously shot and hilariously insightful about the strange, inarticulable ways people can get on one another’s nerves, this psychological thriller takes its premise to surprising, darkly comic extremes.

Chilean writer-director Sebastián Silva’s neither-fish-nor-fowl narrative plays tricks on our minds, without fully engaging our senses.

The film falls apart once its mysteries dissipate. With them go all the dark ambiguities that colored the first hour.

The script unsettles, but never scares, so it doesn't work as a horror film. It's also not a convincing chronicle of deteriorating mental illness.

It ebbs away at the climax, but there’s 45 minutes where it sings loud and strange.