Our wonder mutt London finds himself pursued by a reporter and a crazed scientist who believes the animal is a new breed of super-intelligent dog, and so the duo set a trap by faking a robbery at the home of dear old lady Madeline (Helen Hughes). London finds the elderly woman tied up in a chair and gagged over the mouth with a patterned scarf. After luring the baddies into the basement and trapping them there, London returns to untie her.
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