Trevaline Evans disappeared from her Welsh shop in 1990. Decades later, her family learned the original police file had simply been lost.

Claudia Lawrence vanished walking home from a university kitchen shift in 2009. Police say they know who's responsible. No charge has ever followed.

Melanie Hall was last seen getting into a car outside a nightclub in 1996. Her remains weren't found for thirteen years, and the driver was never identified.

Katrice Lee disappeared from a German military base supermarket at not yet two years old, in a case split for decades between two countries' jurisdictions.

Ben Needham vanished at twenty-one months old from a Greek island farmhouse in 1991. A 2016 excavation searched for his remains and found nothing.

A call from a man who may never have existed sent William Wallace searching for an address that didn't exist, while his wife was murdered at home.

Lord Lucan was named his children's nanny's killer by a British inquest. He has not been seen since the night it happened.

Dorothy Arnold walked out to buy a book in 1910 and never came home. Her family's six-week silence before contacting police may have cost the case its best chance.

The 1947 murder of Elizabeth Short became one of America's most famous unsolved cases, and buried the real woman beneath decades of myth.

Four couples vanished along the same Virginia parkway over eighteen months in the 1980s. Nearly four decades later, the case remains unsolved.