Doctor Theo Raden finds that the most challenging patient of his career, who appears to be a homeless pregnant woman, with memory problems. Can she be trusted? What really happened? As a first-year residency doctor, he has little wiggle room. Fortunately, he has one of the best attendings in the hospital but getting involved in the personal life of one of his patients is a gamble. The expression on her face reminds Theo of the worst time in his own life. He could allow her to confront her own demons...or could he? Stepping outside the hospital, Theo risks sacrificing his profession, his life, and his friends for a stranger. Sophia LaCross can't remember what happened over the last several months, and as she attempts to step back into her routine, she discovers that her life has been shattered. Her roommate and best friend is gone, her job hasn't seen her in months, and someone close to her doesn't want her to know the truth. Theo is pulled into a world of medical evolution, corporate greed, and entertainment. Theo has some friends in high places, but even they think he has been deceived and misled. Step by step, the pieces slowly fall into place, but what they finally reveal is unthinkable.