It's a blustery day in the summer of 1987 in Bratislava, a picture book city in eastern Czechoslovakia.

A man in his 40s, dark hair thick mustache, ducks into a car outside Kubatchnica, the trade consulting firm he runs.

Or at least that's his story.

The truth is,

Florentino Aspiaga doesn't know much about moving goods

from his native Cuba to the rest of the world,

but he does know how to move information.

Aspiaga is one of Cuba's highest-ranking spies. information. Now he's the head of the Cuban General Directorate of Intelligence for all of Eastern Europe, and he's good at what he does.

Two years ago he was named Cuba's Intelligence Officer of the Year.

He's handsome and charming, and people like to tell him things.

Aspyaga drives 50 miles east,

from Bratislava to Vienna.

The evening sky is clear when he arrives there.

He walks briskly to an ornate iron gate and looks up to see an imposing circular window on the facade of a spotless white brick building.

He's memorized the address, Boltzmann-Gasa 16.

It's a Saturday. The American embassy is closed, but Aspiyaga has no trouble

getting the attention of the guard on duty.

He explains that he's a case officer from Cuban intelligence, a commander, someone high up. He's not the first spy to have done this.

Aspiaga's what's called a walk-in, a spy who arrives unannounced at the

intelligence operation of another country hoping to defect.

Once inside, he tells the agents he wants to defect.

And he tells them he has something valuable to share.

...