Antonio's creditors are pressuring him for repayment.
Word comes to Bassanio,he hurries back to vVenice, leaving Portia behind. Portia follow him,with her maid. They are disguised as a male lawyer and his clerk.
When Bassanio arrives the date for the repayment to Shylock has passed and Shylock is demanding his pound of flesh.
Even when Bassanio offers much more than the amount in repayment, Shylock, now infuriated by the loss of his daughter, is intent on seeking revenge on the Christians. The Duke refuses to intervene
Portia arrives in her disguise to defend Antonio. Given the authority of judgment by the Duke, Portia decides that Shylock can have the pound of flesh as long as he doesn't draw blood, as it is against the law to shed a Christian's blood.
Since it is obvious that to draw a pound of flesh would kill Antonio, Shylock is denied his suit. Moreover, for conspiring to murder a Venetian citizen, Portia orders that he should forfeit all his wealth. Half is to go to Venice, and half to Antonio.