On vacation in London, Frank and Joe search for the thief of the Molar Mike, a voice transmitter designed to be implanted in a tooth, but as they close in on a spy recently seen in the city, the suspect list grows.
Frank and Joe Hardy race to solve find the culprit behind a series of burglaries and suspicious accidents plaguing a motorcycle exhibition and competition.
The Alden children find what appears to be a Native American mask in a trash can and set out to learn its significance--and catch a thief--after it is stolen.
Conor enlists his friends Jack and Timmy as members in the latest chapter of the Freaky Joe Club with a mission to fight evil in Ship's Cove, Texas, and they begin to investigate their first case right away when bicycles start to disappear all over town.
High school friends Sam and Gilly steal a hidden cache of money from Gilly's dad and head to Atlanta where they embark on a search to find the Witches' Carnival, a magical party attended by beautiful people that has been going on for decades.