Astrid Nielsen works in the library of the judicial police. She has Asperger's syndrome. With an incredible memory, she excels at analyzing files of ongoing investigations. The district commander decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date.

Two couples, a child, the lake, the city, behind. Firefighters are here too, unless Audrey dreams them. The threat is always real.