For 18 years, a mass murderer successfully alluded the FBI.

He was wanted for the murder of his entire family.

The old satin'clock

And storms in purple flow

Here I'm a red light This is how art and science

This is how art and science led to his capture.

The List family lived in this large Victorian home in the quiet, affluent town of Westfield, New Jersey.

John List was a 46-year-old accountant.

He and his wife, Helen, had been married for almost 20 years.

They had three children, 16-year-old Patricia, 15-year-old John, and 13-year-old Freddie.

John List's elderly mother, Alma, also lived with the family in her own separate apartment on the third floor. The List children attended local schools

and were all active and popular. John List was a devout Lutheran and taught Sunday school.

In the fall of 1971, the list house stood empty.

The family was away visiting a sick relative, but when a month went by with no signs of activity,

neighbors grew suspicious and decided to call the police. They felt that something was wrong,

and they asked us to check the house,

which we did.

When police arrived,

they entered the house through an unlocked window.

The house was cold,

and there were no signs of activity.

But they heard music.

...