Twelve-year old orphan Emma Casey lives by a haunted graveyard in her Tennessee town, giving tours, and helping her brother and Granny Blue with the family bakery, and waiting for the destiny dream of her ancestors--but when it comes it shows her only a key, and she finds that she must solve a ghostly mystery that has haunted her town for generations.

The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house

Geronimo and his friends set sail to the Ratlapagos Islands to search for a sunken treasure. He soon begins to suspect that they aren't the only ones looking for the treasure

After discovering a clue from an old pirate captain, Amelia Bedelia digs for buried treasure.

While staying at the Crooked House, the family home of their housekeeper Mrs. McGregor, the Aldens try to solve a riddle that will lead them to a hidden treasure

The Aldens visit Grandfather's friend at the Ogopogo Retreat and aided by puzzling clues, embark on a treasure hunt to prevent the retreat from being sold

"The Kidd children--including twelve-year-old twins Rebecca and Bickford--follow mysterious clues that take them from China to Germany, in the hopes of finding their missing father and the treasure that will finally free their kidnapped mother"--

Nearly seven thousand years ago, a priceless piece of history vanished in the Caucasus Mountains near Armenia. Former government agent Sean Wyatt and his sidekick Tommy Schultz go deep into the heart of some of the oldest mountains in the world in search of a treasure that many believed was lost to antiquity. While they and their new friend, Adriana Villa, race toward their goal, they encounter deadly villains and a man with an evil plan that could...

While the Aldens are visiting a friend of Grandfather's at the beach, Benny finds a long-lost piece of a map to a legendary pirate treasure, a discovery that brings unwanted attention from fortune hunters

Seventh-graders Sloane and Amelia are devastated to be paired for a research project about long-lost jewels, but soon they are finding clues hidden for nearly a century--and realize they are being used.