Ep 3. The Cold Equations (English Subtitled)

In Italian with English subtitles. The disappearance of a married couple leads Inspector Vivaldi and Stefano to suspect the woman's son. Meanwhile, the sudden death of a professor triggers renewed interest in a 15-year-old cold case: the unsolved abduction of a young girl, Irene Ferrer. The professor had been working on cryptic equations before his death, which could explain his demise.