"The sales of Harry Potter and the Deathly Hallows in the UK and across the globe are eclipsing those of the previous Harry Potter books by a considerable margin," said Christopher North, head of books at Amazon.co.uk. "Although the children's version remains the bestseller, we have seen a strong uplift in sales of the adult version compared to previous years, perhaps illustrating that people who have grown up reading Harry Potter are taking their love of the series of books into adulthood."