A 13-year-old mystery. A hidden letter. A search for truth. For 13 years, a dark secret lay hidden beneath a carpet in southern Johannesburg. Then, on a regular autumn night in 2012, a sweaty supermarket chef renovating his home stumbled across a three-page letter, which revealed the anatomy of a grisly murder. The letter began with the words: ‘If you are reading this then I am dead’. It was typed in neat bullet points, listing a series of violent abductions perpetrated by a gang trying to cover up the murder of a 37-year-old woman named Tandiwe ‘Betty’ Ketani. Within days the letter made its way into the hands of a private investigator known as ‘Doc’. Teaming up with a colleague and two detectives from the Yeoville Police Station, Doc made sure the Ketani case was woken from a long slumber. Whether the real mastermind behind the crime will be captured remains unknown, so does the true motive for the murder. In court, prosecutors said the case was like a mosaic, with all the pieces coming together to form a disturbing picture. Not all the pieces have been found. But already, this has become one of South Africa’s most intriguing crime stories.