Millionaire businesswoman Pamela Hargan and her youngest daughter Helen are found dead in their family home in McLean, Virginia. The strange and haunting crime scene puzzled investigators – was it a murder-suicide or was it staged to look like one? There was conflicting evidence all around. 48 Hours correspondent Peter Van Sant examines the suspenseful case in this 6-episode series, "Blood is Thicker: The Hargan Family Killings". Detectives try to untangle mixed motives from mother-daughter discord, to sibling rivalry, jealousy and a family fortune. Find out if blood is really thicker when it comes to the Hargan family.