The Knocking on the Door

In this captivating episode, Dr. Fu-Manchu demonstrates his skills in disguise and villainy. He takes on the guise of a long-bearded professor while visiting London's famous Madame Tussauds waxworks. The plot thickens as detectives Nayland Smith and Petrie venture out of London to investigate eerie occurrences at a secluded country cottage.

This film is part of the adventure serial genre, showcasing the popular tropes of the time. With its intriguing storyline and engaging characters, it reflects the early 20th-century fascination with crime and mystery narratives. The film features performances by H. Agar Lyons, Fred Paul, Joan Clarkson, Humberston Wright, Frank Wilson, and W.G. Saunders, contributing to its dramatic tension and appeal.