I think Nails is about 70% complete while the rest was just air pockets. Can't believe it managed to create the genuine horror atmosphere like it supposed to, without delivering a proper finale. It's like the movie decided to hang itself instead of going all the way. It was on the right track!
It's not your usual standard haunting, those come with a good ending. The more of today haunting movie always seem to have a twist. Another character involved, one that stood low for so long and now his crimes are being resurfaced. Nails is a pretty much straight forward production, with plenty of black outs, some attempts at jump scares and a better character development than most. Dialogue is OK, camera works nicely but the script was surely enough incomplete. Just some details missing, but important links that would have offered a proper flow to the movie and would have better connected the viewer to it.
Similar movie, as in one that almost impressed but barely missed the mark sadly, is The Haunting of Helena. If you liked this one be sure to check that one too.
Cheers!