Continuing its quest into unusual true-crime stories, Investigation Discovery offers the documentary series `Evil Twins', in which each crime involves a set of twins. Sometimes the twins are both on the wrong side of the law, sometimes the twins turn on each other, and in some cases, they turn on their family. Each episode chronicles the events that led up to the crime, sometimes going as far back as the twins' birth. From a set of twins who work together to kill their father to brothers whose criminal lifestyle leads them to turn on each other, their stories are real, raw and disturbing.