P.C. Hawke is a teenage sleuth who always seems to be on the case. In this first book in the thrilling P.C. Hawke Mysteries series, P.C. and his friend Mackenzie can't believe that their friend Tom, a custodian, has been accused of murdering a biologist at the Museum of Natural History. As they try to get to the bottom of things --- and hopefully prove their friend innocent --- P.C. and Mackenzie discover a famous stolen necklace and a huge tarantula named Aristotle.