Playback: A BBC Radio 4 Full-Cast Dramatisation

Clyde Umney instructs him to meet the eight o'clock train from Chicago, and shadow one of the passengers. The lady in question, Eleanor King, is beautiful, classy and clearly unhappy. Obediently, Marlowe follows her - all the way to Esmerelda, where she's going under the name Betty Mayfield and being leaned on by a cheap blackmailer.