Fantômas plans to blackmail a Scottish laird. The French inspector pursuing Fantômas follows him to the Scottish castle to protect the owner, and to catch Fantômas.
There is a lot of trouble at the big evening party but Fantômas makes his usual getaway.
Towards the end of the movie Hélène disguises herself as Lady Rashley (Françoise Christophe) in an attempt to capture Fantômas. She is seen unmasking: the unmasking was achieved with the usual sleight of hand and camera.
René Daudin & Anatole Paris were the makeup artists.