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 irony.

Steakknife.

Listen first on BBC Sounds.

This is a download from the BBC.

To find out more, visit BBC.com.ukuk slash radio four.

Hello, today I've come to the furthest western edge of the United Kingdom, Land's End, in Cornwall,

one of the wildest, most elementally exposed spots in the entire British Isles. With the Atlantic waves encroaching on both sides, this tiny spit of land is visually

uplifting and potentially menacing.

No wonder it's inspired so many of our great writers.

In our continuing series, exploring the country's literary landscapes, I'll be finding

out how the beauty and power of this Cornish environment has been harnessed by writers down the centuries.

My guide to this majestic hinterland, which has historically been cut off from the rest of Britain for economic, logistical and perhaps cultural reasons too, is Patrick Gale, one of the county's foremost contemporary novelists.

At least five of his 60 novels use Cornwall as a setting.

Born in the Isle of Wight, Patrick has been based here since the late 80s

and lives with his partner on a working farm right here in Lansend,

with an unparalleled view of the outer edge of the landscape

he's chosen so often as his

...