Robert Louis Stevenson 
Jekyll and Hyde 

He put the glass to his lips and drank at one gulp. A cry followed; he reeled, staggered, clutched at the table and held on, staring with injected eyes, gasping with open mouth; and as I looked there came, I thought, a change – he seemed to swell – his face became suddenly black and the features seemed to melt and alter – and the next moment, I had sprung to my feet and leaped back against the wall, my arms raised to shield me from that prodigy, my mind submerged in terror… First published in 1866, Jekyll and Hydewas an instant success. Stark and skilfully woven, this fascinating novel explores the curious turnings of human character through the strange case of Dr. Jekyll, a kindly scientist who by night takes on his stunted evil self, Mr. Hyde.