Los Angeles Police detective Erin Bell arrives at a crime scene and recognizes the markings on the body as those linked to a gang she infiltrated years earlier while working undercover with her partner Chris. She is visibly haunted by her past, bearing the scars of a botched operation that ended in tragedy and left her with profound guilt. Erin's journey is one riddled with self-destruction and estrangement from her partner, Ethan, and their daughter, Shelby, whom she struggles to connect with. She embarks on a dogged quest to find the gang's leader, Silas, driven by a mixture of vengeance and an opportunity for redemption.

With each encounter, Erin draws closer to confronting the demons of her undercover days. As she reconnects with old contacts and faces former gang members, her actions begin to blur the lines between legal and extrajudicial. Her mission becomes increasingly personal, compromising her professional duties and the relationships she still has a chance to repair. As Erin delves deeper into the criminal underworld, piecing together Silas's whereabouts, the toll of her obsessive pursuit becomes evident, with the cost of her unresolved past threatening to overshadow her present.