It is always night in the cave. Take my cold hand.

Once in a while, floods bring more than driftwood. Something comes floating down the river on that stormy afternoon in Old Castle, and eight-year-old Fern Keegan is there to catch a glimpse of it through the pouring rain. A fleeting glance, but enough to last a lifetime.

Weeks before Fern Keegan sees what she sees standing in the river tunnel, a deranged patient, Gabriel Bogdan, makes an outrageous claim nobody at The Hillside psychiatric hospital believes until it's too late.

Thirteen years later, a school tour in the local cave unravels into blind terror when the teachers and students realise they are not alone in the wet underground chasms of horror.

The river runs through it, and the river runs deep.

My name is Daisy, but you may know me as Crazy Daisy.