Signs of the crime -- The crime scene -- Collecting evidence -- Photography -- Telltale marks -- Finding a body -- Lifting prints -- Showing the invisible -- Summary -- Who is it? -- Evidence from blood -- DNA analysis -- Teeth and bones -- Making faces -- Matching fingerprints -- Unknown culprit -- Proof of guilt -- Summary -- Crime lab -- The autopsy -- How did they die? -- Trace evidence -- Dirty proof -- Computers and crime -- Bombs and fires -- Drugs and poisons -- Weapons -- Fakes and forgeries -- Summary