Not so long ago, forensic specialists were either fingerprint or ballistics experts. Today, police departments nationwide have a vast cadre of investigatory expertise available to them, as once-controversial techniques have become commonplace. Plunge into the heart of confounding mysteries to see how criminals are caught today.

Invisible Clues heads north to probe two telltale cases. First, a body is discovered in a park, wrapped in sheets. At the medical examiner's office, workers find a single carpet fiber on the dead woman's body. They bring in Skip Palenik, a microscopist who analyzed evidence in the McVeigh and Hillside Strangler cases, and he enables the police to connect the body to the killer.

Next, there's another body dumped in a park, and the investigation focuses on the woman who has taken over the victim's rooms in a sleazy motel. The investigation falters, however, until they get a call from a woman in Washington State who has received a strange package. Inside is the clue the police need to break the case...

Gripping and authoritative, Invisible Clues offers an inside look at forensic investigation. Includes interviews with officers, investigators, and forensic experts. Traces two baffling crimes from initial call to conviction.