Susannah Cahalan's Brain on Fire: My Month of Madness was published by Simon & Schuster last year, and has seen a good deal of success--it has sold 25,000 copies at the outlets tracked by Nielsen BookScan. But it's the e-book edition that's currently flying high: priced at just $2.99, the Kindle edition is currently ranked #6 overall (outpacing the print edition by leaps and bounds) and, as of April 9, is enjoying is 14th day in the top 100. The deep discount is just one example of the pricing flexibility made possible by the settlement of the e-book pricing fixing case.

While the death of a well-known person can do great things for sales, the death of former British Prime Minister Margaret Thatcher has not led to a big jump in sales of by or about her in the U.S., as no title showed up in the Amazon bestsellers lists.