When Martina accuses her ex-boyfriend - the son of a powerful local judge - of assault and battery, no witnesses can be persuaded to testify on her behalf and one lawyer after another refuses to represent her. Guido Guerrieri knows the case could bring his legal career to a premature and messy end but he cannot resist the appeal of a hopeless cause. Nor deny an attraction to Sister Claudia, the young woman in charge of the shelter where Martina is living, who shares his love of martial arts and his virulent hatred of injustice.