Sax Rohmer

“ Sometimes at night, as he sat watching the furnaces, this fear would come. It was not physical; in a physical sense he feared Krauss, because of the man's superhuman strength; but it was not fear of a sudden attack which haunted the night watches. It was something worse, something which Teak lacked the subtlety of mind to define.
Of the insanity of Krauss he entertained no doubt—in fact, he regarded the ape-man as scarcely human; but the character of Weissler defied him.
The source of his apparently inexhaustible wealth was a most provoking mystery. That it was crooked Teak never questioned ”

“ Krauss, the name by which the bearded creature was known, he discovered to be Doctor Weissler's partner in the undefined enterprise which engaged them in Moscow. Weissler, in whom Teak was not slow to recognize a clever man and a dangerous enemy, conveyed, without definitely stating it for a fact, that Krauss at times became subject to a form of homicidal mania, a heritage of experiences during the late war. ”

“ At a dilapidated works which had been rented by Dimitri the famous furnaces were installed. Here Doctor Weissler presided, but Trepniak was unknown. In a palatial residence near the Bois de Boulogne, leased from a Jewish financier weary of the lady who had occupied it, M. de Trepniak entertained the smartest people in Paris. Here Doctor Weissler was unknown and Mr. Michael never came.
Krauss was occasionally present but always invisible, whilst Teak's duties sometimes took him to the palace in the Avenue and sometimes to the derelict factory at Batignolles. ”