The Knocking on the Door

The evil Dr Fu-Manchu proves to be a master of disguise as well as villainy in this thrilling episode of the popular adventure serial. Adopting the persona of a long-bearded professor, Fu-Manchu pays a visit to London's Madame Tussauds waxworks. Elsewhere, there's something horribly uncanny going on at a remote country cottage: sleuths Nayland Smith and Petrie leave the capital to investigate.

• A.E. ColebyDirector

• H. Agar LyonsDr. Fu Manchu
• Fred PaulNayland Smith
• Joan ClarksonKaramaneh
• Humberston WrightDr. Petrie
• Frank WilsonInspector Weymouth
• W.G. SaundersJames Weymouth