In 1915, in the middle of the First World War, Gabriel Ferraud, a soldier of the French army, was wounded on the front. Rescued and evacuated, he was approached by army officials. He learns that he is selected to integrate an ultra-secret research project: the Sentinels program...

Gabriel must join the Sentinels Brigade if he wants to see his family again, who believes him to be dead. After the attack of the secret military laboratory, an investigation is carried out, which does not please Colonel Mirreau, at the head of the program of the Sentinels...