If you and I took a walk down a shopping street in Jo'burg or Cape Town or London, we see two guys looking in a shop window, we think, "Oh, they're wondering what they're going to buy." A cop looks at them and thinks, "Why are they standing there? Are they doing a drug deal? Are they going to mug someone? Are they going to rob the shop?"

Most of us have one big idea at some point in our lives. That Eureka! moment. It comes to us all in different ways, often by chance of serendipity.

There's a difference between what I call a dumb ghost and a smart ghost. The smart ghost is Hamlet's father - you know, he says, "Get revenge, my son!" That's incredibly rare. It's much more the grey lady in the same place everyday, moving across the floor.

I've always been much more scared of the living than I am of the dead.

A news junkie, I read, daily, the 'Times/Sunday Times,' the 'Guardian/Observer,' 'Mail,' and the 'Argus' - both to keep up with crime in Brighton, where I set my novels, and because I think it is vital to support local papers - they provide a unique accountability for councils, emergency services and so much else, and are dangerously undervalued.

The biggest qualification to be a good police officer is to have a high degree of emotional intelligence.

There's a really classic cliche every time you switch the TV on - you see cops arguing. I have spent a day a week for many years in the presence of police and I have never seen them argue. It's a military hierarchy. They do what they're told. There's no bickering.