Pathé film number 1244, a remake from Ferdinand Zecca's film of the same name (1901). This version was known as "What is Seen Through a Keyhole" (US) and "What Happened: The Inquisitive Janitor" (UK). Titles get often confused. This version is currently considered lost.
Reviews
Steineded
How sad is this?
Executscan
Expected more
Anoushka Slater
While it doesn't offer any answers, it both thrills and makes you think.
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Philippa
All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.