Searching for movie where dead body is fed to pigs

[admin]

Submitted by Matt:

Searched for ages but can't find the name of a relatively recent film.

Vaguely remember the plot relating to a publisher moving into a fancy new apartment but strange things start happening i.e. being terrorized/recorded whilst sleeping. In the end he suspects/ kills the detective, and then goes to feed him to the pigs at his secretary's parent's farm but it turns out that his obsessed secretary? has plotted out the whole thing was devised by the secretary who wrote it all down in her unread manuscript.

Do you know the name of such a movie?