Due to the graphic nature of this killer's crimes, listener discretion is advised.

This episode includes discussions of suicide, violence, and murder.

We advise extreme caution for children under 13.

On a Sunday evening in March of 1915, 46-year-old Henri Landreux stood in a Paris metro train.

As was his habit, he scanned the flow of people around him,

looking into their tired faces.

When his eyes landed on 19-year-old Henri Babaelet sitting alone,

he saw what he'd been searching for, weakness.

As Henri approached her,

Henri glanced up and flashed him a wide smile.

Henri grinned back.

This would be easier than he thought.

He introduced himself as Lucian Guillet and Baud.

After a brief conversation, Henri asked Henri to accompany him to a room he

rented in Gardenore.

Over a week, Henri stayed in the rented room and Henri paid for everything she wanted.

And just when she thought she couldn't be happier,

he invited her to live with him in his country house.

Henri needed very little convincing.

She quit her nannying job,

wrote a letter to her family and bid adieu to Paris.

Henri believed she had finally met the man of her dreams.

...