DAVID Hicks is to cash in on his notoriety with a book deal that could pay a six-figure advance. Terry Hicks, father of the former Guantanamo Bay inmate, said a book was in the pipeline. David Hicks's Adelaide-based lawyer, David McLeod, said he had been inundated with expressions of interest. Literary agents said publishers would pay six figures because public interest in Hicks had not waned since he was released a year ago. ..... Hicks cannot profit from any book sales, but his father can.