When Susan Saunders witnesses a terrible accident involving her best friend near her childhood farm in North Dakota, she is admitted to Hammer Smith Psychiatric Unit, whereby she remains there for the rest of her youth and into adulthood. Susan is diagnosed with a rare psychiatric disorder known as Dissociative Identity Disorder, as her therapist believes that she suffers from what is known as multiple personality syndrome. Susan is haunted by troublesome dreams, and a Succa being a 'devil dog.' Susan is put forward for an experimental trial of a psychiatric drug nicknamed, 'White Knight.' During Susan's journey there are several characters revealed being the prostitute, the Holy Man, the lawyer, and the boy. These characters represent the extremities of humanity: promiscuity, betterment, greed, and innocence. As events unfold, links are revealed between the characters, and the reader is left to decide whether these characters were just a figment of Susan's imagination or reality.