Who pushed Eric down the stairs?

Right before he moved away, Sebastian Barth's friend Eric had an unfortunate accident. Now he's sending Sebastian mysterious notes hinting it wasn't an accident at all.

Was it the ghost in the cemetery?

Was Eric's accident linked to the ghost that' haunting the cemetary?

Sebastian doesn't really believe in ghosts, but he's seen the shadowy figure in black and heard her moan and cries.

What did Eric know?

If Sebastian and his friends can decode Eric's strange notes, maybe they can solve the mystery of the ghost. But before Sebastian discovers what Eric knew, he must face a modern day evil more dangerous than any ghost from the past.