Bonus: Introducing Rosa Ellis

"She was not just a spy - she was a spymaster". The family secret of Rosa Ellis

• 4 mins

Bonus: The sound design

What does the inside of an atom sound like? Meet our sound designer for Season 2

• 3 mins

S2.1 A grave matter

The man who stole the atomic bomb. And why he did it

• 20 mins

S2.2 A split life

The world’s most dangerous spy? A young scientist’s journey into espionage

• 40 mins

S2.3 Unstable elements

The fate of the world is decided: Klaus Fuchs joins a top-secret atomic bomb mission

• 31 mins

S2.4 A stable bond

The spy meets his spymaster

• 37 mins

S2.5 An irreversible reaction

A double life gets more dangerous. Fuchs joins America's bomb project

• 28 mins

S2.6 Camp Y

Lives on the line. The Fuchs family is drawn into the espionage

• 38 mins

S2.7 Critical mass

The interrogation of a spymaster. Ursula is questioned as Klaus Fuchs returns to England

• 29 mins

S2.8 The uncertainty principle

The spy catchers close in. Klaus Fuchs is caught in the crosshairs

• 30 mins

S2.9 Dead cat, live cat

A double life implodes. Fuchs faces judge and jury

• 30 mins

S2.10 Fallout

Jail awaits - Klaus Fuchs is going down. But will he take Ursula with him?

• 33 mins

Trailer: The Black 14

The lives of 14 black American footballers are changed forever in a fight against racism

• 2 mins