Her name is Lai Wan, and if you let her stand in the same room as you, your every dark secret, your every dark mistake - every damning bit of shame and regret within your soul - will be hers to do with as she pleases. Desperate to stop a serial killer, the police begrudgingly enlist her aid. But what began almost as a joke, bringing a so-called 'psychometric' sleuth onto the case, soon spirals far out of their control as Lai Wan's own desire for revenge against the killer goes well beyond any earthly sense of justice.