Old Hollywood and the Detection Tale

Which classic-age tales of detection would I have wanted filmed in the studio era?

1. The Four Tragedies of Memworth (Lord Ernest Hamilton). Chinamen and a multiple murder make for a rousing and convincing tale.

2. Murder Must Advertise (Sayers). The problem here would have been, How to film the migraine in Chapter 4, the funniest and most palpable migraine description in all literature?

3. An Oxford Tragedy (John Cecil Masterman). A German law professor solves the crime: a don shot dead.

4. Case of the Seven Whistlers (George Bellairs).

5. The Congo Venus (John Canaday). Women missionaries and a cover-up in an excellent story.

6. The Body in the Silo (aka Settled Out of Court) (Ronald Knox). The monkey could have been as big a star as Lassie.

7. The Nursing-Home Murder (Ngaio Marsh and Dr. Jellett). With the possible exception of Death in a White Tie, the best Marsh; the "nursing-home" is actually a hospital operating room.