Ep 6. The Evil Twin

In CSI: Cyber season 1 episode 6, titled "The Evil Twin," the Cyber Crime division of the FBI deals with a case involving a set of twins and the murder of one of them. The episode opens with the discovery of an unconscious young woman on the steps of a police station. The woman turns out to be a twin named Rachel, who is in shock after witnessing the murder of her sister Lisa. Rachel tells the investigators that her sister was kidnapped and then drowned in a bathtub by Lisa's identical twin, Laura.

The case takes a turn when Laura denies any involvement in the murder and claims that she was the one who was kidnapped and held hostage by Lisa. Laura, who works as a nurse, also tells the investigators that she was injected with a sedative by Lisa, which resulted in her being unconscious during the time when her sister was killed.

As the investigation progresses, the team discovers that Lisa had a history of mental illness and had been diagnosed with a condition called Munchausen syndrome by proxy. The condition, which is also referred to as factitious disorder imposed on another, involves a caregiver (in this case Lisa) fabricating or exaggerating symptoms of illness in another person (in this case Laura) to gain attention or sympathy.

The team also discovers that Lisa had been using her sister's identity to create an online presence and had been using a fake profile to lure men into relationships. The fake profile was of Laura, which created confusion and suspicion around the case.

The investigators use advanced cyber technology to track down the real perpetrator and uncover the truth behind the murder. Along the way, they also discover the use of an online forum where people with similar mental illness conditions discuss and share information.

The team's efforts lead them to Lisa's therapist, who had been unknowingly enabling Lisa's behavior and had even fallen prey to the fake profile set up by Lisa.

The episode concludes with the team successfully tracking down and apprehending the killer, providing a sense of closure for the victim's family and friends. The case highlights the dangers of mental illness and the internet, emphasizing the importance of keeping a close watch on our loved ones and staying safe online.