The Sorrows, an island off the coast of northern California, and its castle have been uninhabited since a series of gruesome murders in 1925. But its owner needs money, so he allows film composers Ben and Eddie and a couple of their female friends to stay a month in Castle Blackwood. Eddie is certain a haunted castle is just the setting Ben needs to find inspiration for a horror film.

But what they find is more horrific than any movie. Something is waiting for them in the castle. A malevolent being has been trapped for nearly a century. And he’s ready to feed.