From The Perry Mason TV Show Book (Revised)
Someone entered Phil Schuyler’s bungalow on Halloween and threw an electric heater into the bathtub while the Phil was taking a bath. He never knew what hit him. An eyewitness testifies that only Damion White (played by David Hedison of Voyage to the Bottom of the Sea) went into the bungalow during the time of the murder, but Perry thinks otherwise. After all, weren’t trick-or-treaters coming and going all night long?

Future Academy Award winner Ellen Burstyn appears in this episode.
+ Ellen is best known for her Academy Award performance in Alice Doesn't Live Here Anymore.