This episode includes depictions of drug use and addiction. Please be advised.

July 1975, Dalton Lee shuffles down Avenida de los Insohentis in the heart of Mexico City.

He glances at the traffic roaring by, then slips behind a lamppost. He pulls a small glass vial

from his pocket and taps a small pile of the white powder inside it onto his hand, then leans down

and snorts it. Lee feels an immediate surge of power and excitement as the cocaine courses

through his body.

He takes out a roll of adhesive tape, tears off two strips and sticks an X on the lamppost.

Then, checking nervously over his shoulder, he darts back down the street.

His signal has been sent.

The next evening at 6pm, Lee leans against a palm tree outside the Polyphoram cultural centre.

He gazes up at the famous March of Humanity mural, his mind, a blurred mix of anticipation and fear.

Lee has been snorting cocaine and smoking marijuana all afternoon,

and now shuffles nervously on the spot to contain his twitchy energy. Then, as if from nowhere,

he sees his KGB contact, Vasily Okana, approaching on foot. The signal on the lamppost has worked.

Do you know the restaurant in San Francisco?

Lee is surprised that Okana insists on going through their password protocol,

given they already know each other, but he plays along.

No, but I know the restaurant in Los Angeles.

Okana nods in approval and motions for Lee to follow him.

Okinae leads Lee to a small park.

Palms and jacaranda trees sway overhead as a local taco seller plays mariachi music from his tinny radio.

A man steps out of the shadows and walks towards them.

...