by Franklin W. Dixon (2000)
It's Career Week at Bayport Elementary, and Frank and Joe's school assembly turns up some interesting guests. One student's uncle is an animal trainer who brings a chimpanzee. Another girl's father is an anthropologist who brings in a mask decorated with feathers and shells from a Pacific island. But when the assembly is interrupted by a fire drill, the mask is stolen and the Hardys spring into action.
Carolyn Keene
The Dean of Emerson College enlists Nancy to investigate the thefts of a valuable substance being used in a top-secret experiment. But when Nancy discovers that the experiment involves biological mutations, she knows she must find the culprit before the lives of everyone on campus are endangered.
Astrid Lindgren. [Dt. von Karl Kurt Peters
While three children are waging an imaginary war against their three friends, they find themselves involved in an actual murder case, which they solve with clues revealed by subsequent events of their own war.
Franklin W. Dixon
Hiking the Appalachian Trail with their friends, Chet, Phil, and Biff, the Hardys hit a snag when daredevil Biff gets hurt. The old mining town of Morgan's Quarry is the nearest place for help. But even the run-down, isolated town turns menacing when two tough locals drop a bag full of money in front of the brothers! Joe and Frank are stonewalled when they ask about the money. The roads are washed out, the phones are down, and a crumbling mansion hides a gold mine of secrets. Every fork in the road leads to more danger...and everyone in Morgan's Quarry seems bent on makng sure the boys don't make it out alive!
Franklin W. Dixon
Three Books in One Original concept was titled "Hardys on Vacation". Title was changed to celebrate the Hardy Boys 75th Anniversary in 2002. Contains the following books: 1. The Caribbean Cruise Caper, 2. Daredevils, 3. Skin & Bones Skin & Bones