Gertrude Barrows Bennett & Francis Stevens 
THE HEADS OF CERBERUS (Dystopian Classic) [EPUB ebook] 
The First Sci-Fi to use the Idea of Parallel Worlds and Alternate Time

What would you do if inhaling a mysterious dust transports you to a future totalitarian Philadelphia in 2118 AD where you are face to face with the mythical and ferocious three headed dog Cerberus? Who will succeed in killing you first – the government or the beast? Find out for yourself in this dystopian sci-fi classic!
Gertrude Barrows Bennett (1883–1948) was the first major female writer of fantasy and science fiction in the United States, publishing her stories under the pseudonym Francis Stevens. Bennett wrote a number of highly acclaimed fantasies between 1917 and 1923 and has been called 'the woman who invented dark fantasy.’