While their family is away, Harold and Chester, a dog and a cat, are boarded at Chateau Bow-Wow where Chester becomes increasingly alarmed by the strange behavior of his fellow guests and the sudden disappearance of one of them.

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father in solving the case.

Presents two adventures of Sherlock Holmes and Dr. Watson each accompanied by a section identifying the clues mentioned in the story and explaining the reasoning used by Holmes to put the clues together and come up with a solution. Also includes a map highlighting the sites of the mysteries.

Encyclopedia Brown, brilliant fifth-grade amateur detective, solves ten crimes. The reader may match solutions with those at the end of the book.