A woman comes home to her twin sons wrapped head to toe in surgical bandages, and the boys decide the person beneath them cannot possibly be their mother.

GOODNIGHT MOMMY (2015), originally titled Ich seh, Ich seh, takes place almost entirely inside one isolated countryside house during a brutal summer. Susanne Wuest plays the mother, recovering from cosmetic surgery, while Elias and Lukas Schwarz, real-life twins, play the sons who grow convinced she is an impostor.

Directors Veronika Franz and Severin Fiala shot in Austria and let the heat and the silence of the farmhouse do much of the work. There is little dialogue for long stretches, only the boys watching, testing, and waiting for the bandaged woman to slip up.

What starts as a domestic mystery turns into something far crueler, as the children's suspicion curdles into a plan. The film gives away almost nothing until it must, and what it reveals recontextualizes everything that came before it.

It is a horror film about grief and denial as much as shock, and it uses the ordinary setting of a family home to get somewhere genuinely disturbing.