TV Guide Investigation Discovery Thursday

The case of eight-year old Zachary Bernhardt who vanished in September 2000 from his Florida home late at night while his mother was out. When another boy went missing, new theories emerged and years later Clearwater Police continue to follow leads in the case

The case of 13-year-old Ashley Summers. Trouble brewed for the fun-loving teenager when she started keeping secrets. When she disappeared from home, investigators had to contemplate whether she was just another runaway

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

The case of Tracie Andrews, whose 1996 road rage attack killed her lover Lee Harvey. Plus, Hampshire businessman Mike Gifford-Hull's TV plea for his missing wife Farsi that hid the true facts of her disappearance

The story of Brian Williams (aka basketball star Bison Dele) and his girlfriend Serena Karlan, who vanished with their skipper Bertrand Saldo while sailing in the South Pacific in July 2002. Their catamaran was discovered tied up and abandoned at a port in Tahiti. Investigatiors focused their attentions on the only person likely to have information - the missing man's elder brother who had also been on the boat and believed to have moored it

The case of Michelle McMullen, whose car was found abandoned in September 2008. Pennsylvania investigators set about determining whether she was abducted or on the run, as $2,000 was found to have been stolen from the Susquehanna township church where she worked