Nathan Crosby's Fan Mail - Tapa dura

When Gideon Turner is booted out of the bloodstock agency to which he has devoted twenty years, his first thought is to hope that the business collapses around the unspeakable Peter Twiston-Foster's ears. His second, is to wonder what next.
The answer? Write a thriller, using his knowledge of horses and the turf. He could be the next Dick Francis, even. In spite of the mild derision of his wife, he sets to. Nobody is more surprised than himself when the result, Nathan Crosby's Fan Mail, is eagerly accepted by a publisher; nobody is more stunned when the book is a massive bestseller and he becomes famous overnight.
And then the first letter arrives, addressed to Nathan Crosby and signed in the name of the book's murderer. And next comes the first violent death . . .