After the first world war, Frankie Drake, came back to Toronto, after serving as a dispatch messenger and spy, and became a private detective, with her friend Trudy Clarke.
From the first season, Frankie and Trudy deal with investigating con artists, stopping thieves, and kidnappers, while dealing with some social, and economic issues like prohibition, and women's suffrage, Frankie also runs into interesting characters, like Ernest Hemingway.