 This part of his memoirs had been released in March 1899, three months before the preface to "Mörkrets makter" appeared in "Dagen".Furthermore, De Roos identified various elements in the main text of "Mörkrets makter" that seemed to be inspired by Wadström's memoirs, such as the appearance of a "White Lady" and the viewing of a fiery sky from a gallery placed on the top floor.As De Roos deems it highly improbable that Bram Stoker himself would have inserted these elements from a Swedish publication, or would have consented to such a plagiarism, he raises severe doubts whether Bram Stoker ever was aware of the Swedish serializations.