Investigators are drawn into the dark world of high-end prostitution, illegal aliens and Russian organized crime.

Four brutal murders in one bloody weekend devastate the small town of Barrie, Ontario. The prime suspects, three violent, escaped convicts, are on the loose. But while police conduct a massive manhunt, they begin to discover that the evidence isn't adding up. As the frightened city demands answers, detectives and forensic scientists find themselves in a desperate race to find those responsible.

The discovery of an abandoned suitcase containing a young Asian woman's body leads North Yorkshire police to London. But instead of answers, the mystery only deepens when they discover that a second woman is missing. The killer's trail leads investigators and forensic scientists halfway around the world - only to discover that the key to unlocking the mystery has been under their noses all along.

The murder of a gay couple in rural California has police stymied - who would want to hurt the well-liked pair? As investigators and forensic scientists dig deeper, they suspect that the killings are linked to a series of arsons that have destroyed several synagogues and an abortion clinic. The trail leads them to the sinister world of hate crimes -- and a chilling plan that must be stopped.

After the owner of a private school for Asian students vanishes from his driveway, police scramble to find him. The search grows desperate as time begins to run out on the diabetic man who is desperately in need of his medication. Investigators soon have their answer - he has been kidnapped. Now, can they save him before it is too late?

Spotlighting the tools that are used by forensic investigators.

Explosive experts sifting through bomb evidence discover a more insidious plan.