The Clue of the Hissing Serpent

Two teenage brothers, Frank and Joe Hardy, embark on an adventurous mission to solve a mystery surrounding a hissing serpent. They investigate why a wealthy sportsman is terrified by the serpent design on a mysterious balloon, leading them to protect him. Additionally, they look into the theft of an ancient life-size chess king intended for the winner of the world chess championship. Facing dangerous enemies, the brothers discover a clue that takes them across the Pacific to Hong Kong to assist the police in dismantling an international criminal organization.