Lauren Stafford, a traumatised divorcee, decides to rent a cottage on the edge of a beautiful ancestral estate in the Welsh Marches. But from the very first day of arrival she instinctively knows there's something terribly wrong here - something malevolent and ancient - a feeling the whole place is trapped in a time warp. She really ought to leave. But the pull of the lake is too strong, its dark magic so powerful that it crosses over into dreams...turning them into nightmares. What lies beneath its still black surface? And why can't Lauren drag herself away? Why her? And why now?