The Clue of the Hissing Serpent (Hardy Boys, Books 53)

Why is a wealthy sportsman so frightened by the serpent design on a mysterious balloon that he begs Frank and Joe Hardy to protect him? And who stole the ancient life-size chess king which is to be presented to the winner of the world chess championship? Targets of diabolical enemies, Frank and Joe find a clue that leads them across the Pacific to Hong Kong to help the police smash an international criminal organization.

• The Mysterious Caravan (The Hardy Boys, No. 54)
• The Shattered Helmet (The Hardy Boys, No. 52)
• The Witchmaster's Key (The Hardy Boys #55)
• The Masked Monkey (Hardy Boys, No. 51)
• Hardy Boys 56: The Jungle Pyramid (The Hardy Boys)
• The Firebird Rocket (The Hardy Boys, No. 57)
• Hardy Boys 58: The Sting of the Scorpion (The Hardy Boys)
• Danger on Vampire Trail (The Hardy Boys, No. 50)
• The Bombay Boomerang (Hardy Boys #49) (The Hardy Boys)
• The Arctic Patrol Mystery (Hardy Boys, No. 48)