Noise

No pun intended - going mad - it can happen with sound "attacks". This starts off with a shock - but subtly so ... well as subtle as sound piercing and "attacking" you can be. But visually speaking we are left wondering ... I'd say we kind of can guess where this all went ... still the sister will come into the picture (no pun intended again) and the story or rather the search begins.

Now suspension of disbelief is quite high here. While you have things that I'd say are logical (her trying figure out what happened in her apartment, before they moved in for example. Yet also not trying hard enough ... which is more than a shame to be honest.

Than there are issues with "logic" - but again, if you are able to suspend them too ... the movie is able to thrill you from start to finish. You just have to tune in to it and forgive the characters for their mistakes ... be it their actions or reactions to certain things ... or even the unwillingness to either call the police or other authorities at time ... or go and check stuff with them ... there are things hidden ... but not well enough I suppose ... or too good? I reckon police can be "bad" too (at their jobs that is). Still sometimes you have to believe what you see ... or hear ... otherwise it's not there (yes that was a final pun)