1. What the Trees Know

A Georgia man suffers 17 stab wounds while on a hunting trip, and authorities rule his death a suicide, shocking his family. Another man disappears without warning -- the only clue is his burned-out car, found 14 hours from where anyone saw him last.

3. Secrets in the DNA

A truck driver finds an unconscious woman on a Missouri motorway, and police determine the suspect attacked her elsewhere and placed her on the road; an unknown killer bludgeons a mum and her daughters at home while her son and nephew cling to life.

4. Unseen Enemies

The murder of billionaire couple Barry and Honey Sherman in their mansion stuns Toronto, since Barry is a pharmaceutical mogul with many enemies, but it is unclear who would kill his wife; a New York teen disappears after a mysterious road trip.

5. The Stuff of Nightmares

A 14-year-old disappears in Aruba while on a jet ski ride with an older man; a man kidnaps a young woman from the parking lot of her boyfriend's apartment building.