Between 1995 and 2005, a serial killer murdered and dismembered at least 20 victims - only 5 of which were ever positively identified. This killer is officially unidentified, yet researchers of today are quite certain who committed these horrible crimes.

The case has been described as the most unsolved murder case in Indonesian history, becoming a fixture of popular culture and inspiring amateur detectives to attempt to resolve it.

Five brutal killings and 15 missing kids, the police had neither clues nor suspects. The Black Joker Killer is believed to be a foreign man who gave himself that nickname to conceal his identity from authorities. He left clues and his mask in the crime scene the day after the police discovered his place. The police investigation into the Black Joker Killer remains open and unsolved.

NB: Warning reminder for reader under 18! This book contains adult and gore scenes. Take it wisely!