It's a holiday investigation for Frank and Joe Hardy! Frank and Joe go undercover at a New York City home for teenage runnaways during the annual Thanksgiving meal, after one of the home's former residents is pushed off a subway platform.

Hardy Boys slam into the new century, cracking a host of new cases! Frank and Joe are sent to Niagara Falls to stop someone from destroying the national landmark. Then they're sent on another case. Then another. They're not usually this busy with ATAC, and their cases are usually more important than these. Seems this case might be more layered than a double dip with chocolate sprinkles. . . .

Frank and Joe Hardy must investigate threats made against the local mall by an extremist environmental group called STEMM.

The Hardy boys investigate a suspicious death and other events at Uncle Bernie's Fun Park.

In Killer Connections, the detective duo learns that the headmaster of The Willis Firth Academy is in peril along with his daughter—and maybe even the Hardys themselves! Can the boys wrap up their mission before someone loses a life?

The third book of the Blair-witch-like abduction trilogy. Frank has been discovered at long last and may posess key answers to questions that will solve the mystery of the LOST abductions once and for all.

ATAC BRIEFING FOR AGENTS FRANK AND JOE HARDY MISSION: To find the mastermind behind a possible attack at the Big Air Games. LOCATION: Philadelphia, PA. POTENTIAL VICTIMS: Top extreme athletes in the country. Thousands of spectators. SUSPECTS: There may be a group of extremists working together. There may be just one.