Author Stephen Williams. December 24, 1990. St. Catharines, Canada. A 15 year-old girl is enjoying the evening with her older sister and her sister's boyfriend at their parents' house. What she doesn't know is that her drink has been laced with sedatives. Later, she will be sexually assaulted by both and would die as a result of the attack. The details of what happened that night are disturbing, but this couple was far from finished. With her sister's death ruled an accident, Karla Homolka & Paul Bernardo would go on to attack other young women. Joining us will be author Stephen Williams who has written two books on the case and has corresponded with Karla herself. How his life changed because of his research into this case is also beyond belief. Be sure to read Invisible Darkness & Karla, his two books on the infamous couple.