Robert Louis Stevenson 
The Strange Case of Dr Jekyll and Mr Hyde 

An intriguing combination of fantast thriller and moral allegory, The Strange Case of Dr. Jekyll and Mr. Hyde depicts the gripping struggle of two opposing personalities—one essentially good, the other evil—for the soul of one man. In this case, there are two personalities within Dr Jekyll, one apparently good and the other evil. An immediate success upon its publication in 1886 and a cultural touchstone to this day, The Strange Case of Dr. Jekyll and Mr. Hyde is one of the most disturbing stories ever told.