Not necessarily. Larry King, arguably one of the best television interviewers ever, never read the books his guests had written. He felt his questions would be more genuine, without already knowing what was in the book. Plus, he said most of the audience would not have read the book either, making his curiosity more parallel to that of the audience. On the other hand, other great interviewers, (Oprah for example) always read the books their guests have written. So it really depends on the interviewing style of the interviewer.
But Allan needs to be willing to use thos