The dastardly Goddard hooks up Dr. Farrington to his own invention, the solar-powered VFX Accumulator. Unless Dr. Farrington tells his secret formula, when the sun rises, it'll electrocute his lovely daughter Gloria and himself.
1932's Murder At Dawn is a bizarre and mostly pretty awful spectacle, involving two young couples cowering and running around the halls of an ancient mansion full of secret passages, while dead bodies pile up. And there's some plot about a Wall Street financier who's murdered, and the judge who's investigating, and blah blah blah. But this stuff, involving the fabulous solar-powered death ray, is pure gold - the Accumulator and its sizzling electrical effects were created by Kenneth Strickfaden, who (not surprisingly) also worked on Frankenstein. [IMDB]