The Mysterious Moonstone

In this thrilling adventure, two friends are trapped in a detective novel and must catch a crook.
Cleo and Evan have a secret. A collection of books so dangerous they are locked up tight. A friend has vanished inside the pages of one of them. It's up to them to find the key that will set her free.
A PRICELESS DIAMOND... STOLEN!
When Cleo and Evan go undercover to help a rookie detective interview a mansion full of suspects, nothing is as it seems. They must catch the crook-and find the right key-or they could be trapped inside this mystery forever...
Praise for Key Hunters
"Luper's delectable humor is appropriate for the intended age group, and the plot will keep readers' attention to the end... [t]his is a satisfying read for beginning independent readers." - School Library Journal