This is slight.
“The night is dark and full of terrors.” Yes. I suppose it is.
The phrase is something of a mantra for Melisandre of Asshai, a character introduced in the second of George R.R Martin‘s Song of Ice and Fire books, and therefore the second series of A Game of Thrones.
She’s to be played by Carice van Houten, a splendid actress, and the woman you can see in the image at the head of the post.