Lamont Cranston (Rod La Rocque), amateur criminologist and detective, with a daily radio program, sponsored by the Daily Classic newspaper, has developed a friendly feud that sometimes passes the friendly stage with Police Commissioner Weston (Thomas E. Jackson). He complains to his managing editor, Edward Heath (Oscar O'Shea), over the problems that have developed in his department since Phoebe Lane (Astrid Allwyn) has been hired as his assistant. He is advised to forget it since she is the publisher's niece. During his broadcast about Honest John (William Pawley), a famous safe cracker who has served his time, Phoebe gives him a note that the Metropolitan Theatre is to be robbed at eight o'clock and she is so insistent that he adds it as his closing note. Off the air, he learns she got the information from a man she met in a café who had an honest face. Cranston goes to the theatre where Weston and his men have gathered and, of course, nothing happens but, across town, a safe is ...