After failing for the third time an exam, Roberta plans to get round it by seducing the grim professor Giannelli. She manages to sneak into his apartment the night before the fourth trial to pass the exam. The skirmish between Roberta and professor Giannelli goes on all the night long. Roberta seems next to offer herself to Giannelli's lust, to retreat soon afterwards. In his turn, Giannelli repeatedly threatens to go away, annoyed by Roberta's contradictory behavior, but is soon persuaded to stay by her blandishments and titillations. Each one wants something from the other and knows what the other wants from him/her, but it all remains unspoken. In the end Roberta leaves, double sure to have won the game, but a nasty surprise quenches her presumption when she fails the exam for the fourth time. Yet, is she actually the final loser of this no holds barred match?