Charley and Jack love Amy and Kitty. Amy is about to go away, and Charley thinks he may miss his opportunity to ask for her hand. He discovers that his aunt, a Brazilian woman he hardly knows, is coming for lunch. Now the aunt can chaperone while the boys ask the girls to marry them. Naturally, things don't go as planned. When the aunt is late they enlist the help of their friend, Lord Fancourt "Babs" Babberley to dress up and pose as Charley's aunt, and a hilarious afternoon of mistaken identity ensues.