The episode starts with a woman walking into the precinct and reporting a case of child abuse. When the detectives go to the apartment where the mother and baby live they discover that the woman that reported the abuse is the same woman that she accused. They set out to find her baby, and they find the woman, Janis, hiding in a cave and saying that she is only a kid. They take her to the precinct and Huang evaluates her. He says that she has Dissociative Identity Disorder. As the detectives progress in the case, they discover that Janis and her sister were abused by their father when they were younger. While the sister, Cass, was in prison, they developed a plot to kill both of their parents. The plot was for Janis to pretend to have Dissociative Identity Disorder, and get off for killing their parents. The find this out after the trial, so they cannot arrest Janis or it would be double Jeopardy, so they arrest her sister.
I, personally, liked this episode. The twist at the end, when we find out that Janis had been faking the disorder, had me wondering what was going to happen. My personal favorite 'alternate' was Dory. I loved the scene were she was at Elliot's house with a knife and Kathy. This was a good start to a new season and I thought it was a winner. I recommend this episode.