BLACK LAKE | BBC4 9PM

We can only assume that

Rentaghost wasn’t on TV in Sweden when this lot were kids, because if it had been, they’d know full well that whenever something supernatural seems to be happening, you DO NOT go into the cellar. But Hanne is convinced that the only way to find out the resort’s dark secret is in the hidden room in the basement – so all that remains in tonight’s finale is to see if she can figure it out and save everyone…