The Math Inspectors: Story Two – The Case of the Mysterious Mr. Jekyll (Volume 2)

Sixth-graders Stanley, Charlotte, Gertie and Felix did more than just start a detective agency. Using their math skills and their gut instincts, they actually solved a crime the police

The Math Inspectors: Story One – The Case of the Claymore Diamond (Volume 1)

When the Claymore Diamond is stolen from Ravensburg’s finest jewelry store, Stanley Carusoe gets the bright idea that he and his friends should start a detective agency. Armed with