When Drake discovers that his friend and fellow Dragon Master, Bo, is trying to steal the Dragon Stone, he wonders if the dark wizard might be behind it, and he must try to find a way to protect the stone while keeping Bo's family out of danger.

When Crazy Horse and Cadillac, two very different but inseparable horses, go missing from the Half Moon Ranch in Colorado, thirteen-year-old Kirstie tries to recover the stolen animals.

Dink, Josh, and Ruth Rose help catch the thieves who have stolen gold from Sammi's parents, the king and queen of Costra.

After a class trip to a floating zoo where animals are mistreated and Savannah's missing pet monkey is found in a cage, Long Island sixth-grader Griffin Bing and his band of misfits plan a rescue.

Thea's friends the Thea Sisters travel to India where they investigate when the monkeys living in the city start stealing jewels.

While attending the Cuckoo Clock Carnival in Germany, the Thea sisters investigate the theft of a famous clock.

When a ring is stolen from the queen, Stanley, who is on vacation in London with his family, teams up with the world-famous detectives of Scotland Yard to track it down.

Eva's teacher, Miss Featherbottom, is getting married, but when her special necklace disappears, Eva and her friends set out to track down the thief and return the necklace before the wedding.

The fifth graders of Liberty Falls Elementary have a reputation for trouble, but they still have a field trip to the mansion of Edward Minks (local inventor, founder of the town, and great-great-great grandfather of fifth-grader Eddie). While there, they search for secret inventions that are rumored to be hidden in the mansion--but they find that they are not the only ones searching, and somehow this class of trouble-makers must work together to thwart...

Griffin Bing is in big trouble when a Super Bowl ring disappears from his middle school's display case, replaced by Griffin's retainer, and the more he and his friends investigate, the worse his situation becomes.