On a winter's night in 1974, a crime took place that would obsess the nation.

It was an extraordinary news story.

The story of an aristocrat, Lord Lucan, who's said to have killed the family Nanny,

mistaking her for his wife, then somehow just disappeared.

One of the great mysteries in English criminal history.

We're still looking for Lucan.

It's honestly one of the most powerful stories of my lifetime.

I'm Alex Fontunzelman.

This is The Lucan Obsession.

Listen on BBC Sounds.

Everybody comes out to me, they chuck me under my chin and they sort of say,

oh, your father's daughter, are you a poet?

Shouldn't you be a poet?

Do you write poetry?

Your fares is daughter.

So I mean, it used to be highly irritating.

So, you know, I would complain to my father and I say, you know, what is this?

So he sort of took his usual drag on his cigarette

and he said, one poet in a family is more than enough.

Hey, it's Mubina Zah here.

And today I'm in the company of a Pakistani legend.

Even before we get down to business,

...