Astrid Nielsen, works in the library of the judicial police. Suffering from Asperger's syndrome, however, she has an incredible memory, so she is very useful in analyzing the files for ongoing investigations. The district commander, having noticed this ability, decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date. In addition, also to reciprocate, he will try to help Astrid on the behavioral side, in order to provide mutual help.

Paris, the late 1960s. Madame Claude is at the head of a flourishing business dedicated to prostitution that gives her power over both the french political and criminal worlds. But the end of her empire is closer than she thinks.