Nicholas Carter 
Twin Mystery [EPUB ebook] 

Excerpt: ""Mr. Nick Carter: I have come to town to do business. I give you notice before I begin, because I am quite certain you will be informed immediately after I commence operations. It really makes little difference; you cannot reach me. Really, my dear Nick, I have a contempt for the so-called detective ability. You, with your Ida, Chick and Patsy, are a little better than the rest, but you are in the same running when you undertake to stop me. "The Brown Robin." This letter Nick Carter found in his mail one morning a short time ago, on coming to his breakfast table. He read the letter with some interest, noting that it had been mailed late the afternoon before, and in the sub-district in which he lived. Tossing it over to his wife, Edith, to read, he said: "That might be taken for a challenge, I suppose." Edith read it, and replied that she should take it for an impertinence. "Who is the Brown Robin?" she asked. "Ah! That is the great mystery, " answered Nick.""