隐身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.