Betty Caldwell's younger brother, Eric, is a talented speaker and speaks out against crime to full auditoriums and, naturally, his mother and sister are proud. However, gangsters seek to undo his crusade by framing and kidnapping him. Betty and her boyfriend, Bill, a heavy-weight champion of the U.S. Marines go after the crooks. While Bill is an asset, Betty shows herself able to throw a punch with the best of them and seems to have some judo skills as well, tossing a full-grown man with ease over her shoulder.