The Killer Inside: The Ruth Finley Story is a captivating Lifetime movie about Ruth’s ordeal during the reign of terror by the BTK killer. Amid mysterious threats, panic, and chilling letters, Ruth is abducted, only to reappear, leaving investigators bewildered. The haunting climax unveils a distressing revelation about the perpetrator. Teri Hatcher’s portrayal of Ruth is compelling and draws viewers into the gripping narrative.