Thirteen-year-old Teddy Fitzroy and his girlfriend, Summer, investigate when a mountain lion is accused of killing a prized dog outside of FunJungle Wild Animal Park in the Texas Hill Country.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, Joe and Frank search for the truth.

When a celebrated goldsmith from Hawaii creates a necklace for a famous actress, rumors that the necklace is about to be stolen prompt Geronimo Stilton's investigation to identify the thief.

In 1989 someone is threatening to steal the crown jewels, so the Queen of England summons Mac B. to England to protect them--and when they are stolen from a locked dungeon cell, where Mac and Holcroft, one of the warders, are supposed to be guarding them, it is up to Mac to figure out how they were stolen, and whether the thief is the descendant of an Irish soldier-of-fortune who tried to steal them in 1671, or someone else entirely.

Twelve-year-old Teddy investigates when a popular Texas zoo's star attraction-- Henry the hippopotamus-- is murdered.

Teddy Fitzroy must solve the crime of the kidnapped rare and expensive panda, Li Ping.

Nate the Great goes to San Francisco to solve a mystery with his cousin, Olivia Sharp, who is also a detective.

As the fairytale detectives race through the Book of Everafter searching for their baby brother, they encounter various characters including the Editor and his army of Revisers, who threaten the children with dire consequences if they continue to change the stories.

Jaycee and Rachel were best friends until a terrible night when their friendship faltered and Rachel was found dead, but her last text message starts Jaycee on a search that may prove Rachel's death was no random crime.

Nate and his dog Sludge are determined to find the recipe for his mother's monster cookies.