So's Your Aunt Emma! (1942) on Netflix

Plot summary

Emma Bates, a spinster, lives with her unmarried sisters, who are unhappy when she sets off for the city to watch a fight. She arrives without a ticket at a sold-out arena, and reporter Terry Connors, taken off the crime beat after missing a lawyer's kidnapping, gives her his spare one. His fiancée Maris has just walked out on him over a missed appointment at the marriage license office. The lawyer, Rex Crenshaw, worked for the gangster Flower Henderson, whose rival Gus Hammond manages the boxer Mickey O'Banion, the young man Emma has come to see. When two of Hammond's men spot Emma beside Terry, they take her for the gun woman Ma Parker.