When Darkness Follows

Rachel Sommers and her two best friends don't believe anything will happen when they sneak onto a haunted shipwreck in the middle of the night. Why would they? Ghosts don't actually exist... right?
But Rachel and her friends disturb something that night. Something demonic. Something that lured Rachel to the ship. And now one of her friends is dead, the other is missing, and Rachel's memory of the night is gone. There's only one thing she knows for sure: whatever killed her friend has followe...