Captured at Gallipoli on 25 April, 1915, Sergeant Berenger, an uncompromising professional soldier, escapes Turkish imprisonment. He enlists the assistance of three unlikely co-conspirators: Ali, a simple Arab boy forcibly drafted into the Ottoman army with his brother, Mohammad; and Avraham, a Jewish merchant, who determines his future is no longer with the Ottoman Empire. Pursued by the sadistic Tolga from the Turkish prison at Fort Kilitbahir, Berenger discovers the date of the Turkish counter-attack on ANZAC positions. Berenger must return to the ANZAC lines to deliver the intelligence that a massive Turkish counter-attack will commence on 19 May 1915; and he must slip through Mustafa Kemal's 57th Turkish Regiment in order to do so.