Joe, a good natured Italian, runs a basement ice, coal and wood establishment in the cheap Italian "East Side." Trina, daughter of old Capino, a cobbler, lives next door. She is fond of Joe and is relieved when she learns that Joe's "sweetheart," who arrives from Italy, is none other than his little old "Mamma Mia," his mother. Godfrey Kelland, district attorney, is a candidate for the governorship, and Joe's sympathies and efforts are enlisted in his behalf. The Weasel, a notorious crook, is arrested as he seeks refuge in Joe's house, and suspicions are cast upon Mamma Mia. Just at this time Mrs. Kelland loses a diamond pin which is discovered in Mamma Mia's possession. Baby Kelland has placed the pin in the basket of clothes which Mamma Mia is to wash and she is found "guilty" and sentenced to two years in the penitentiary.