Follows the further adventures and misadventures of Hiccup Horrendous Haddock the Third as his Viking training continues and his father leads a stranger and the Hairy Hooligans to the Isle of Skullions in search of a pirate's treasure.

Nancy arrives in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch but finds herself embroiled in a baffling mystery involving a phantom horse and buried treasure. Local people believe that the ghostly animal is carrying out the curse of Dirk Valentine, the romantic outlaw who was killed many years ago at Shadow Ranch, where he had gone to fulfill a promise to his sweetheart. Suspecting that a treasure hidden by Valentine...

Geronimo Stilton, publisher of "The Rodent's Gazette" in New Mouse City, travels with his friends to the Ratlapagos Islands in search of treasure, and soon begin to suspect they are not the only ones involved in the quest.

On a visit to Australia, fifteen-year-old Sam meets Annabel. Together they search for the remains of a legendary shipwreck.

Wiglaf joins the other students of Dragon Slayers' Academy in searching the Dark Forest for the Cave of Doom, which supposedly contains the gold of the dead dragon Seetha.

Farm boy Homer faces another challenger for his uncle's spot in the society of Legends, Objects, Secrets, and Treasures but Dog's hidden ability to smell treasure guides the duo as clues lead them to fantastic mansions and hidden islands.

Diving interns Kaz, Dante, Adriana, and Star take desperate measures to reclaim the sunken treasure that has been stolen away from them by their supervisor Tad Cutter.

Told in different voices, on Centerlight Island, halfway between the United States and Canada, middle-schoolers Keenan and ZeeBee team up to seek gold rumored to be hidden there a famous gangster.

Truly Lovejoy's hopes for a perfect summer are dashed when she is sent to mermaid academy, complete with a sparkly tail, but she finds a new mystery for the Pumpkin Falls Private Eyes to investigate.

Four adolescents try to raise a British ship which sank in the Caribbean in 1665 with a cargo of gold on board. However, they cannot trust anyone not even themselves.