In Bologna, Elisa works for a pharmaceutical company, and, having a degree in chemistry, her task is to study a molecule for a new drug; Elisa has three friends who love her and would like her to have more fun. In this period, however, the young woman is worried because she has the impression that some stranger has entered her house and has moved her glasses and reset the alarm time. Marco is a bouncer, who, due to his short temper and his handsome physique, is nicknamed "beast". Marco and Elisa are neighbors, but they have never met. In the end they will hang out often. Now an unscrupulous criminal wants to force Elisa to manipulate that molecule, and uses the help of Vesna, a young foreigner expert in martial arts, who behaves like an animal loyal to her master.