Lee Child’s Night School is the No.1 Bestselling Hardback Fiction title of 2016. And Martina Cole’s Betrayal is the No.2 Bestselling Hardback Fiction title of 2016. Nicknamed Darley ‘the Deal’ by Martina many years ago, Darley discovered Lee and Martina when they were unpublished. Their success is no flash in the pan. They have both…