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To escape the heat of the city and a court sentence for malicious mischief, the East Side kids agree to visit a summer camp in the Adirondacks. En route, their car breaks down and they are reluctantly given accommodations in the home of Judge Malcolm Parker. The Judge, under indictment for bribery, has much to fear. His life, as well as that of his niece Louise has been threatened by a gang of racketeers; his companion, Giles, has accused him of embezzling Louise's fortune; and his sinister housekeeper, Agnes, blames him for the death of her mistress, Leonora. The Judge's fears are compounded when he meets Knuckles Dolan, the boys' guardian, whom he had unjustly sentenced to death, only to have his verdict reversed and Knuckles exonerated. Later that night, when Louise is kidnapped and the Judge found strangled, Giles and Simp, the Judge's bodyguard, accuse Knuckles of the murder, but the boys capture Simp and Giles and determine to find the murderer themselves. Muggs and Danny discover a secret panel in the library wall and enter a passage where they find Louise's unconscious body and glimpse the figure of a fleeing man. Knuckles captures the man, who identifies himself as Jim Harrison of the district attorney's office. Amid the confusion, the real killer takes Louise captive, but the boys track him down and unmask Simp. Harrison then identifies the bodyguard as the triggerman seeking revenge on the Judge. With the crime solved, the boys can finally leave for their summer camp.