Random but I saw this thriller/horror movie once and forgot what it was called. It’s about this blonde girl who is house sitting and a guy who wants to kill someone tries to invade the home. It turns out the form a relationship and cause mischeif around town.  I think they may hook up but not sure.  In the end *spoiler* she turns out to be a killer herself and is the one who was actually killing people.  I think it takes place during either halloween or the night before halloween.