Finn hates water. She's haunted by terrifying nightmares in which she is running before a huge wave, which threatens to engulf her in the watery darkness forever. And the dreams are getting worse. Ever since Finn, her mum and her two younger brothers arrived in Cornwall, Finn has had an uneasy feeling.

Maybe it's just the nearness of the restless and unpredictable Atlantic, but Finn is sure that something more sinister lies beneath her visions.

Then she discovers the strange curse that was laid upon the cottage years ago, and she knows the cold and vengeful Griffiths has something to do with it.

She's seen him, endlessly tying and retying a length of rope, creating the knots that - superstition has it