A law clerk (Rosamund John), aided by her boy friend (Derrick De Marney), attempts to solve the murder of a client (Mary Jerrold). Al: Harry Fowler. Playfair: Felix Aylmer. Douglas: John Bentley. Rosemary: Joyce Heron. Stewart: Jack Allen. Sarah: Henryetta Edwards. Barbara: June Elvin. Daniel Birt directed.