"I'm at your house."

Whilst watching it is difficult to perfectly understand what's going on, but as someone else said, reading the IMDb analysis after really helps explain it (and it does sorta make some sense).
Regardless of all that the first half is excellent in it's tension and creepiness, whilst the second half is equally exciting in an almost Tarantino-esque way. The music throughout is superb.

Great soundtrack !!