Francis Worcester Doughty, Shadow, the Mysterious Detective… (1883)
“ I guess I kin fetch the grub as fast as you kin stow it away."With Shadow's departure from the restaurant we must drop him for a while. But we again introduce him, disguised as a mulatto, as he glided up to the writer of these lines, and, with extended hand, simply said:"Shadow!"Was this Shadow?I could hardly believe my eyes.Adept as I was myself in the arts of disguise, if this was the mysterious detective, he was able to equal if not even outdo my ability."Shadow!"So he repeated, when I allowed a full minute to pass without having spoken a word."Are you Shadow?" ”
