In America, they have specialist mystery book stores with whole sections devoted to cat mysteries, golf mysteries, quilting mysteries. It's a hugely broad genre from the darkest noir to tales of a 19th-century vet who solves crimes, thanks to his talking cat.

I've often said the reader knows every bit as much about Thorne as I do. When I created him for 'Sleepyhead,' I was determined he should be a character who would develop, book by book, change and grow as we all do, and who - crucially - would be unpredictable.

A reader's own imagination is a far more powerful form of CGI than anything any movie can provide because it's unique. In your own imagination, you can enter all sorts of worlds, and they are unique to you because no other reader will interpret a book the same way.

Ian Rankin's Rebus is the king of modern British crime fiction. He is dour, determined, and constantly falls foul of his seniors. For all this, we root for him. He is eminently loveable, a quixotic hero moving through the darker half of a Jekyll and Hyde Edinburgh.

Too much research can be the writer's enemy. You can spend days on end in the British Library or prowling the streets with a Dictaphone, and it's easy to convince yourself that you're working hard. Often, it can be an excuse not to work; a classic displacement activity.

It may sound surprising, but a joke and a crime novel work in very much the same way. The comedian/writer leads their audience along the garden path. The audience know what's coming, or at least they think they do until they get hit from a direction they were not expecting.

There are a number of writers who believe it is their duty to throw as many curve balls at the reader as possible. To twist and twist again. These are the Chubby Checkers of crime fiction and, while I admire the craft, I think that it can actually work against genuine suspense.

I believe that if writers want their readers to care about a character, they have to care themselves. I have to root for a detective who screws up as much as Thorne does, who shares my birthday, my North London stomping ground, and my love of country music, both alt and cheesy.

Whether your audience is in a sweaty basement club or nestled in a favourite armchair, good money has been paid, and attention has got to be grabbed if you are not to be heckled off the stage or find your novel discarded in favour of the latest volume of 'Fifty Shades of Whatever.'

I think there's as much violence, in a way, as a scene with two women having a cup of coffee in a Ruth Rendell novel - in terms of emotional violence and the violence you can inflict with language - as there is in the most graphic kind of serial killer/slasher novel you can think of.

I used to be something of an obsessive when it came to research. When I first began writing the Thorne novels, I would drive to a set of traffic lights in the early hours of the morning to make sure you could turn left. I thought it was important to get even the most trivial details right.

As crime writers, we put these characters, year after year, book after book, through the most horrendous trauma, dealing with grief and death and loss and violence. We can't pretend that these things don't affect these characters; they have to. If they don't, then you're essentially writing cartoons.

I'd read one too many crime novels where the victim was just a name: body number one, dead woman number 12. I understood fear, and I wanted to create characters who made readers say, 'Please, don't hurt this guy.' That's the key to suspense. It's easy to disgust a reader. It's much harder to make them care.

As I write each new Thorne novel, I'm determined that whatever is happening plot-wise, a new layer of the onion will be peeled away and reveal something about Thorne that is surprising to me as much as anyone else. If I can remain interested in the character, then hopefully the reader will stay interested, too.

There have been some brilliant and very successful standalone books that work in themselves and also seem to refresh a series. Anyone who writes a series lives in fear of it becoming stale, so you do whatever you can to keep it fresh - although it does feel a bit nerve-racking to write outside of your comfort zone.

I do have a touch of OCD, and I used to obsess about research. But I'm better than I was. Gone are the days when I would drive to a set of traffic lights to find out if you could turn left. I finally realised it didn't matter. A book will not stand or fall on whether or not there's a branch of Starbucks in Brixton.

We didn't have all the distractions that young people have today. We didn't have these incredible computer games and social networks to engage with. I understand that. But once young readers do discover reading, when they discover a book which they fall in love with, it really unleashes something new in their imagination.

Whether you do stand-up comedy or write a story, you have a duty to deliver. As a comedian, you walk out on stage, and you have a minute to hook them, or they'll start booing. As a writer, it's very similar. A reader doesn't have time to say, 'I'll give him 50 pages, as it's not very good yet, but I hope it'll get better.'

It never ceases to amaze me that readers who are willing to suspend their disbelief when it comes to the motivation of a vicious serial killer get high and mighty because I have put a coffee shop where there isn't one. Er... it's a novel. I made one up. I'm allowed to make stuff up. I'd go as far as to suggest that I make stuff up for a living.

Cormoran Strike is an amazing creation and I can't wait for his next outing. Strike is so instantly compelling that it's hard to believe this is a debut novel. I hope there are plenty more Cormoran Strike adventures to come. A beautifully written debut novel introducing one of the most unique and compelling detectives I've come across in years.

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