A rumor that Blackbeard's buried treasure is somewhere near Tupelo Landing causes pirate fever to sweep through town just as clues about Mo's Upstream Mother surface and the Desperado Detectives--aka Mo LoBeau and her best friends Dale and Harm--take on the most important case of Mo's life.

The Alden children travel to Hannibal, Missouri, to solve mysterious activities near a friend's cabin.

Eleven-year-old twins Jason and Julia, along with their friend Rick, find themselves in ancient Egypt in search of an important map after going through a magical door in their old English mansion.

After moving from London to an old mansion on the English coast, eleven-year-old twins Jason and Julia discover that their new home has twisting tunnels, strange artifacts from around the world, and a mysterious, locked door.

Christina 10, and Grant 7, along with their friends, travel to London, England in search of clues to solve the mystery of Big Bend.

For the first time, Ruth is heading to Newfoundland instead of spending the summer traveling with her dad. When she arrives, she finds Newfoundland is different from her life in Toronto--people there are more friendly, but also superstitious. Ruth's cousin Ruby is also staying for the summer, and the two discover they have a lot in common. But while Ruby believes in spirits and fairies, Ruth believes in science and cold, hard facts. When they find...

Christina 10, and Grant 7, travel to Cairo, Egypt in search of solving a mystery and saving themselves from becoming mummies.

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

The Thea sisters are off to Japan on a cultural exchange program. While they're busy exploring Kyoto and admiring the beautiful cherry blossoms, a valuable item is stolen from their friend Kumi's family. Will the five mice be able to catch the thief?