Danger is the name of the game when the Hardys agree to help their pen pal from Greece, Evan Pandropolos, search for a priceless, ancient Greek helmet. Years ago, Evan’s uncle had loaned it to Hollywood movie company for use in a silent motion picture, but the treasured helmet had been lost. Picking up foes along the way, the young detectives unearth clues that keep them constantly on the move—from their Greek college campus to California and finally to Greece.

When the Hardy Boys take a winter vacation in Jamaica, Joe finds an ancient bronze death mask washed up near their beach house during a violent storm. Helping the Hardys and their friends in this bizarre mystery is William, a Jamaican boy, who flies to New York with startling news, only to be intercepted and held for ransom—the death mask! Frank and Joe must rescue William, plunge into their father’s airline-ticket theft case, and fly into a maze of danger in Africa.

First valuable antique weather vanes are stolen in Pennsylvania Dutch Country and Frank and Joe are hired to catch the thieves. Meanwhile, their father is asked to find a missing Navy employee and a top-secret government document. What is the connection between the missing weather vanes and the Pentagon spy? The final chapters of this thrilling mystery uncover a stunning revelation!

The Hardy Boys series, first published in 1927, has sold more than 70 million copies! Now with a brand-new look, this is an edition that collectors won't want to miss! In The Missing Chums, the fourth book in the incredibly popular, long-running series, Frank and Joe Hardy must save their friends from a rogue group of kidnappers. A special treat for Hardy Boys fans and any reader who's new to the series.

Frank and Joe Hardy become involved in a case affecting national security when Joe dials a wrong telephone number and gets the Pentagon. Two words— “Bombay Boomerang”— that the boys hear before the line goes dead plunge them into a whirlpool of danger and intrigue. At the same time, Frank and Joe must save their father from a murderous gang stealing mercury shipments in the Baltimore harbor. With clues linking the mercury thefts to the top secret Super S missile mysteriously stolen from a government arsenal. In a race against time, the three Hardys foil a diabolical scheme to create widespread havoc in the United States.

When five Egyptian statuettes are stolen from a museum, the Hardy Boys travel to exotic Egypt. En route, the boys are asked to safeguard a mysterious mummy and find themselves tangled in a web of international intrigue. On the Nile, the young detectives uncover a secret hiding place with countless stolen treasures and realize they must get to the police fast!

A series of museum thefts launch the Hardy Boys on this baffling mystery. Rare collections of ancient pirate treasure are being stolen, so Frank and Joe are asked to stake out the Black Parrot, a suspicious freighter docked in Bayport Harbor. This whirlwind chase after a self-styled pirate king in the Caribbean stronghold of the Empire of the Twisted Claw makes a gripping tale of suspense and high adventure.