The Sorrows

Something is trapped in the castle, and it wants to feed!
 
The Sorrows, an island off the coast of northern California, and its castle have been uninhabited since a series of gruesome, unexplained 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 an eerie and reportedly haunted castle is just the setting Ben needs to find musical inspiration for a horror film.
 
But what they find is more horrific than any movie. For something is waiting for them in the castle. A being, once worshipped, now imprisoned, has been trapped for nearly a century. And he’s ready to feed.