In Northern Ireland, from the late 70s to the early 90s, the IRA killed over 40 alleged informers.

But the man who often found, tortured and sometimes killed these people on behalf of the IRA

was himself an informer, a secret British army agent with the codename Stakeknife.

Who gets to play God? And why me? Why my family?

When lies are still being told

to this day, who do you believe?

I wouldn't even know where to start

and I'm with the IRA

Steakknife

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Hello, you might walk past them every day BBC Sounds, Music, Radio, Podcasts.

Hello, you might walk past them every day.

They might be in your garden or visible out of your window.

But did you know this?

You and the tree in your backyard come from a common ancestor.

A billion and a half years ago, the two of you parted ways. But even now, after an immense journey in separate directions, that tree and you still share a quarter of your genes.

Richard Powers reading from his Booker Prize nominated epic, The Overstory, a love letter and eulogy to the planet's lungs.

Also joining me under a beautiful copse of oak trees on Hampstead Heath,

a novelist and nature writer Melissa Harrison and Jessica J. Lee, author and environmental historian,

because today on Open Book Book we're devoting the

...