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 Fontainezlement.

This is The Lucan Obsession.

Listen on BBC Sounds.

BBC Sounds, music, radio, podcasts.

Hello. The leaves are falling, the nights are getting longer and that late autumn chill is definitely in the air now.

But today on Open Book, we're off to tropical climbs for some unexpected encounters.

From book bands in Florida to the literary secrets of West Sydney.

But first, it's off to Lagos for a Nigerian detective story

that weaves us through the world of the country's megachurches.

Gaslight is Femi-Coyote's follow-up to his explosive debut,

the crime fiction novel The Light Seekers,

and similarly features Philip Tau,

a psychologist who uses his training to spot patterns of behaviour police sometimes miss.

This time, however, he's trading the university setting at the first novel for a potentially even more powerful Nigerian institution, the church.

The result is a page-turning and at times sardonically funny thriller that paints an inside a portrait of a dynamic

country in all its complexities. And I'm very pleased to say that Femme Coyote joins me now in the

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