In the world of true crime it's a common sight: violent men on a rampage, a homicide from a drug deal gone wrong, a robbery or alcohol-fuelled act of violence. But there is another shocking side. There are times when the killer is a close family member, someone trusted, and sometimes that killer is a woman. There's the chilling case of Jessica Wongso, who murdered her long-time friend with a cyanide-laced coffee in a Jakarta café. Also, the tragic case of 10-year-old Zarha Baker, brutally murdered by her stepmother, Elisa Baker. What drove these women to commit these unthinkable crimes, and is there any remorse?