Keeping a guy in prison costs 50,000 bucks a year. Executing one costs a couple million.

More than 100 people have been sent to death row who were later exonerated because they weren't guilty or fairly tried. Most criminal defendants do not get adequate representation because there are not enough public defenders to represent them. There is a lot that is wrong.

Quite often I can be in a bookshop, standing beneath a great big picture of myself and paying for a book with a credit card clearly marked John Grisham, yet no one recognises me. I often say I'm a famous author in a country where no one reads.

And that's the mission of The Innocence Project in New York, is to exonerate people who have been wrongfully convicted, and also work from a policy angle with Congress and state legislatures to prevent future wrongful convictions.

I'm a Christian, and those beliefs occasionally come out in the books.

I was a lawyer for 10 years - a short time, but it molded me into who I am. My clients were little people fighting big corporations, so it was a natural thing to not only represent the little guy but also to pull for him - it's the American way.

When witnesses concoct lies, they often miss the obvious.