Consultant criminalist, Astrid Nielsen, who is also autistic, helps Commander Raphaëlle Coste solve criminal investigations. With conspiracy theory followers or a Native American community, in places as varied as a monastery or a psychiatric hospital, the two women combine their talents to solve these cases. Furthermore, Astrid could well lift the veil on an already old mystery, which her father had already tried to elucidate, but without success. The series, a real audience success in France, is also broadcast in around twenty countries, in Europe, Latin America, the United States and even Japan.