Former lawyer Grisham is upset his reign at the top of the book charts has been ended by the 39-year-old British writer and her six Potter novels, whose phenomenal success has brought her a personal wealth of $826.5 million (GBP435 million).

A TIME TO KILL author Grisham says, "There's no doubt who's number one.

"I was number one for a long time. I tried to act like it was no big deal, but I kind of miss it."