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Escaping from an insane asylum, Ellen Summers (Lana Morris) calls upon "Invisible Man" Peter Brady, claiming that she being held against her will by sinister forces. She further explains that her fiance George Wilson has been falsely convicted of murder and condemned to death. With only a few hours before the execution, Peter must deploy his invisibility to round up the miscreants who have misused Ellen and rescue Wilson from the hangman's noose--assuming, of course, that the girl is telling the truth.