Eek, super-duper creepy!
I had never ever heard of this couple, and yowza, they were some wicked seeds, my friend.
As a married couple with a son, they lured, kidnapped, raped and murdered some 9 to 35 girls (ages 6 and up) across three decades and buried most of their bodies at their chalet (a second home) along the border of Belgium and France. Using a bulldozer.
A fascinating horror story, and a killer reminder that lots of folks ain't what they seem and are not to be trusted.