Renowned psychologist Doctor Sydney Mercer goes about her days keeping a tiny little secret while treating some of Hollywood's (and the world's) A-list; she's losing her mind and becoming crazier than the many people she treats. The trigger of her mental decline that's slowly steering her into psychosis is a mass shooting at a movie theater that she is called on to diffuse. From this point, the doctor's mind is given the push it needs to go from a brilliant psychologist to a borderline psychopath bent on quieting the voices in her head before she has to act on some of these inner impulses which tend to be murderous. 

The doctor reaches out to another highly regarded psychological mind to help treat her symptoms in secret while also collaborating on this vigilante venture of hers to rid the city of "monsters". Her psychiatry practice is put in jeopardy as she devotes more and more time to stopping people that justice has failed to persecute and her obsession with this work slowly begins to swallow her hole and also further her psychosis. 

Her clients that are "off the books", although illegal, serve as a patchwork remedy to the doctor's deteriorating mental state and help her deal with her own mental issues. Mainly, her warped sense of justice that motivates her to take matters into her own hands with a small team of people she works with that hold similar beliefs.  

The doctor and her fellow psychologist become a Batman and Robin-like duo of psychological salvation to the Greater Los Angeles Area. Although she takes precautions like wearing masks and using a voice disguiser to meet with clients, as well as locations she deems secure, she is simply too mentally volatile to be working essentially two jobs and juggling this kind of client list. As the doctor treats her first few clients after bringing on this fellow psychologist, we learn a little bit more about her approach; treat the worst of the worst and if you can't fix them, get them incarcerated. And if you can't get them incarcerated, kill them. 

As this collaborator of hers gets a whiff of her "solution" to her clients' problems, he starts forming an exit strategy in case things turn ugly between him and his potential partner, this generation's Sigmund Freud mixed with hints of Freddy Krueger. Her misguided sense of justice gives her purpose while giving her assistant a reason to put her behind bars, but he struggles with this. As he becomes increasingly trapped between his morality and his obsession with learning from the noted doctor who he also has a blooming crush on, he starts to fear for his own physical safety and mental well-being. Does he risk turning her in and ruining his own life by being complicit, or does he trust the doc's path and hope this is another one of her brilliant endeavors into mental health and wellness that has made her one of the most famous minds on the planet?