The Invisible Man's Revenge (1944)

The American horror film, The Invisible Man’s Revenge (1944), directed by Ford Beebe and written by Bertram Millhauser, follows the story of a mentally unstable Robert Griffin. After escaping from a Cape Town institution where he was committed for murdering two orderlies, Griffin becomes fixated on seeking revenge against the Herrick family. One evening, Sir Jasper Herrick and Lady Irene are inspecting their daughter Julie’s new boyfriend, journalist Mark Foster, when Julie and Mark suddenly leave. Left alone in the residence, Robert seizes the opportunity to confront the couple about their past actions. Accusing them of abandoning him to die while injured on an African safari they went on together, Robert demands his share of the diamond fields they discovered during that trip.

However, Jasper tries to explain that those assets were lost due to poor investments. Despite their attempts to defend themselves, Robert remains convinced that they intentionally betrayed him. Despite his refusal to back down, Robert threatens to sue the Herricks. In an attempt to appease him, they offer him a share of the Shortlands estate. However, Robert suggests a different solution – that they arrange for him to marry Julie. After making this statement, Lady Irene drugs Robert and he passes out in their home. The Herricks come to the realization that Robert has lost his mind. Although they fear his potential actions if they do not comply with his demands, they have no qualms about stealing the partnership agreement they all agreed upon or pushing him further into insanity with their betrayal.