Frank and Joe Hardy struggle to keep murder off the menu at Manhattan's mysterious Jekyll and Hyde Club.

When a visiting dignitary's daughter is scheduled to attend a party at a horror-themed restaurant in New York City, ATAC agents Joe and Frank Hardy are enlisted as undercover protection! But in a building where anything can happen – where the walls literally have ears – can the Hardy Boys find and stop the assassin before it is too late? Ages 8 to 12.

Detective brothers, Frank and Joe Hardy, face new dangers while working for ATAC (American Teenagers Against Crime).

ATAC BRIEFING FOR AGENTS FRANK AND JOE HARDY MISSION: Good thing you're in Egypt, because we have a mystery on our hands. A man has been murdered, possibly over a map to a precious golden mummy. Could there be a curse surrounding the ancient mummy and his treasure? LOCATION: Cairo, Egypt, and the surrounding area. POTENTIAL VICTIMS: Anyone in pursuit of the treasure. SUSPECTS: Several people on an expedition are suspects. Find them before they find the mummy and the money. THIS MISSION REQUIRES YOUR IMMEDIATE ATTENTION. THIS MESSAGE WILL BE ERASED IN FIVE SECONDS.

A mission for ATAC has Frank and Joe Hardy traveling the world. The teenage son of a prominent mid-eastern diplomat has gone missing on the Caribbean island of St. John, and the boys take off to find him. Turns out he's been kidnapped by a group involved in a scheme to rob a sunken Spanish galleon of its treasures and sell them on the black market. Frank and Joe search high and low--fighting thugs and sharks--for clues. When the Hardys finally find their quarry, there's another problem --he turns out to be the mastermind of the ring, not its victim!

When a rogue mentor agent within A.T.A.C. tries to kill them, Frank and Joe Hardy discover that the agent was being manipulated by malevolent forces who kidnapped his son, and the Hardy Boys have until dawn to find the child.

Frank and Joe investigate a bomb threat.