A tormented love story between siblings, Marco and Valentina, both just 20 and their casual meeting with Stefano, a serial killer. Stefano realises that Valentina has a deviated soul but makes the mistake of thinking it is similar to his own one. The reality is very different because while Stefano loves order and cleanliness and killing represents his way of returning to normality, Valentina's life is full of confusion and breaks the most forbidden taboo.