If they can keep up the suspense with this one, and not turn it into a "jump-fest" like Final Destination or whatever, then I'm keen on playing it.
Oooooooh it's an invisible signature... oooooooooh!!
I believe Nietzsche put it best when he said 'YER MAW'
That does look pretty good actually. Provided the atmosphere as you said, keeps up, then it could be a good little title.