I'm Emily Strosser.

My grandfather worked on the first atomic bomb, and in 2020, I investigated another man

who helped to build the weapon that would change the world.

Leah Zalard, the scientist who might have stopped it.

But the story didn't end there.

Coming soon, the next chapter.

In the meantime, I'll be taking you behind the scenes to meet the team as they unravel

the mystery of the man who stole the bomb.

The second season really unerves and unpicks and explores a fascinating story of espionage,

probably one of the most successful espionage missions, potentially ever.

Here's the producer, Zach Brophy.

The Brits and the Americans forged ahead with this massive project to build the nuclear

bomb.

And we have to remember, they were allies at the time with the Russians in the war against

the Nazis, but they kept the Russians out.

The Russians, however, weren't going to be kept out.

I'm right in the middle of it.

There's a man called Klaus Fuchs.

Who's Klaus Fuchs?

Klaus Fuchs is this enigmatic, quite impenetrable personality, like someone very hard to read.

I think even for people who knew him at the time, never mind someone like me who decades

later is trying to make sense of this man, but he was a mathematical genius, essentially.

...