'Ultimate CSI' Contest -- Part Four

CSI Files and DK Publishing are teaming up to bring you an exciting contest at CSI Files, in which we'll be giving away 5 copies of the book Ultimate CSI, which takes fans inside the world of CSI: Crime Scene Investigation. Penned by CSI Associate Producer Corinne Marrinan and science expert Steve Parker, the book is an in-depth look at the characters, the science and the cases of CSI.

Every few weeks, we'll be asking a question here at CSI Files related to CSI and the book. Answer the question correctly and you'll be entered in a drawing to win one of the five copies of Ultimate CSI! Here's the fourth one:

For more information on 'Ultimate CSI,' check out CSI Files' article on the book.

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