It is the summer of 1765. The renowned and exquisitely dressed portrait painter Joshua Pope accepts a commission to paint the wedding portrait of Herbert Bentnick and his fiancée, Sabine Mercer, to whom Bentnick has become engaged less than a year after the death of his first wife. Joshua has barely begun the portrait when a man's body is found in the conservatory. A few days later, Sabine's emerald necklace disappears, and Bentnick accuses Joshua...