En route to free Mazauric, de Clermont is seriously wounded by a German patrol. Djibouti and Gabriel continue their mission without him and unknowingly grow closer to the Übermensch. In the laboratory, Marthe performs the first tests on the new recruit, Aria, a young woman sentenced to death whom she injects with the combat serum.

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...