Something Wicked (S01E04)

Leo and Tom have an unusual commission. They are to paint the wedding portrait of Petronella, the unhappiest bride they have ever seen. Small wonder when they meet her husband to be, the evil loan shark Lucio, and understand that Petronella is sacrificing her own happiness to save her father, who is heavily in debt to Lucio. But Mac recognizes Lucio, who figured in his own past, and he encourages the gang to carry out an exciting sting, which will not only save Petronella from the marriage, but help them to restore to his victims all the money he has stolen from them. (BBC)