The ISS, the International Space Station has gone silent. The crew is in distress. Simultaneously, a decapitated and waxed body is found on a roof in Kazakhstan. Positive identification leaves no room for doubt: the body belongs to an American astronaut currently on a mission on the ISS. A French astronaut, dismissed from the space program, and a Kazakh cop, disowned by his ranking hierarchy, set out to solve this mysterious paradox.

Within the DGSE (General Directorate for External Security), a department called the Office Of Legends (BDL) forms and remote pilot the most important agents of the French intelligence services: Clandestine. Immersion in hostile country, their mission is to identify individuals who may be recruited as sources of information. Operating "under caption", that is to say in a fabricated identity from scratch, they live for many years in a permanent duplicity. Our hero just returned from a clandestine mission six years in Damascus. But contrary to what is required by safety rules, he does not abandon his legend and the identity under which he lived in Syria, thus putting in danger the whole system.