"Tak."

The Duchess of Cornwall with actress Sofie Gråbøl during a visit to the set of Danish TV drama The Killing in Lynge, a photo by The British Monarchy on Flickr.

[Isn't that amazing? The Guardian has the full story. Including the same shot at a slightly different angle. And this quote: "At a reception for the couple, the series's creator, Søren Sveistrup, said: "Prince Charles told me it was Camilla who introduced him to The Killing. He said it was one of the only things they could agree on seeing together."]