The case of a missing girl leads to a gruesome discovery: a graveyard of bones beneath the house of Fred and Rose West in Gloucester, England and several twisted family secrets.

A perplexing series of deaths in Vienna, Austria are linked to murders in Los Angeles, California. Austrian celebrity Jack Unterweger is unmasked as the world's first transatlantic serial killer, whose been reporting on his own murders and hiding in plain sight all along.

Six Belgian girls mysteriously go missing at the hands of "The Monster." But soon, people begin to suspect that Belgium's infamous serial killer may be working for a powerful international pedophile ring.