El Dr. Martin Harris (Liam Neeson) tiene un accidente de coche en Berlín. Al despertar descubre que, de repente, su mujer (January Jones) no le reconoce y que otro hombre (Aidan Quinn) ha adquirido su identidad. Las autoridades le ignoran porque no le creen y unos asesinos le persiguen. Martin se encuentra solo y cansado y se ve obligado a huir. Sin nadie a quien acudir, en un país desconocido, Martin le pide ayuda a una reticente desconocida (Diana Kruger) al sumergirse en un terrible misterio que le hará dudar de su cordura y de su identidad. ¿Hasta dónde estará dispuesto a llegar para descubrir la verdad?.
On the 28th of October 1884 Daniel Paul Schreber, candidate of the National Liberal Party in Chemnitz, suffered a heavy defeat at the elections of the German Reichstag. He was taken up in the mental clinic of the Leipzig University soon afterwards. To his rehabilition he wrote an extensive piece of work, "Denkwürdigkeiten eines Nervenkranken" (Memoirs of My Nervous Illness), which was published in 1903 and led to his temporary dismissal. Hereby Schreber became the most quoted psychiatric patient in scientific literature. The third part was realized by Peter Tscherkassy based on a concept by Ernst Schmidt Jr.
