Due to the graphic nature of this killer's crimes,

listener discretion is advised.

This episode includes discussions of murder, rape, assault,

suicide, and self-harm that some people may find offensive.

We advise extreme caution for children under 13.

In the spring of 2001, Italian journalist Mario Spetsi

hesitated, his finger hovering over the buzzer

outside an apartment building.

He and Douglas pressed in a crime author from America

had traveled to this building to interview the man they believed

to be the serial killer known as the Monster of Florence.

But now that they were there, it seemed both men were nervous

and they had good reason.

They hadn't exactly been invited over,

and Mario was a recognizable figure in Italy.

Well-remembered for his tenacious reporting

during the monster's murder spree in the 1970s and 80s.

Still, they gathered their wits and pressed the buzzer.

No turning back now.

When they gave their names, their suspect happily invited them in,

and with a sharp buzz, they entered the building.

When they arrived at the apartment door, they paused again.

...