The Strange Case of Dr Jekyll and Mr Hyde
By Robert Louis Stevenson
Cover: Chapter 2 illustration: a man in a doorway, a monstrous shadow on the pavement (1904 edition) by Charles Raymond Macauley (1871–1934) · Wikimedia Commons (scan from the Internet Archive of the 1904 illustrated edition) · Public domain
Strange Case of Dr Jekyll and Mr Hyde is an 1886 Gothic horror novella by Scottish author Robert Louis Stevenson. It follows Gabriel John Utterson, a London-based legal practitioner who investigates a series of strange occurrences between his old friend, Dr Henry Jekyll, and a murderous criminal named Edward Hyde.
Summary source: Wikipedia: Strange Case of Dr Jekyll and Mr Hyde · CC BY-SA 4.0