When the Code Busters visit the Carmel Mission, a series of coded messages sets them on the hunt for long hidden pirate treasure.

"Following clues left by their missing father, twelve-year-old twins Bickford and Rebecca Kidd sail from the Caribbean to New York City with their siblings to finish the dangerous quest of their world-famous treasure-hunting parents"--Provided by publisher.

Stanley has trouble discerning between friend and foe when retired pirate MacDowell--claiming to be a friend of Stanley's great-uncle Bart--assists Stanley on a treasure hunt which leads them to the basement of the Darkling family home.

On a fourth-grade trip to a local battle site park, Jon Gummyshoes, fourth-grade detective, learns that sometimes history should rest in peace when he and Mac investigate a tale of ghosts and lost gold.

"People in Somerville love to trade stories about days gone by. The town's young sleuths aren't always interested, but when they hear a local legend of buried treasure, they know it's too tasty to resist. Astrid, Rowan, Quinn, and Jace set off to solve the mystery. What they discover is sweeter than they cound have imagined"--

The Thea sisters continue the search for the seven ancient treasures, using the clues found in Aurora Beatrix Lane's travel diary to find a fabulous emerald which once belonged to Cleopatra--a quest that leads them from Moscow, to the Sahara, and finally Bolivia.

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 by a famous gangster.

"It was 1798 when the Morningstarr twins arrived in New York with a vision for a magnificent city: towering skyscrapers, dazzling machines, and winding train lines, all running on technology no one had ever seen before. Fifty-seven years later, the enigmatic architects disappeared, leaving behind for the people of New York the Old York Cipher -- a puzzle laid into the shining city they constructed, at the end of which was promised a treasure beyond...