When young carer, Suzette Trouten goes missing, Kansas police are drawn into the dark world of one of America's most despicable killers. Former X-ray technician and medical consultant, John Edward Robinson appears to be an upstanding member of the community. But investigators soon discover he is not who he seems. Behind the mask of respectability, he hides a history of crime, lies and depravity. Detectives uncover a seemingly innocent connection between Suzette and Robinson. She moved state to take up nursing work contracted through his company. But there's something else. She and Robinson both participate in BDSM - bondage, domination and sadomasochism. They know each other from online forums, catering for those with extreme sexual tastes. Police discover Suzette isn't the only missing person connected to Robinson.