The Four Corners of the Sky, the 2009 Michael Malone novel promoted during OverDrive’s Big Library Read ebook initiative, was checked out almost 24,000 times from May 15 through May 23, according to preliminary data provided by OverDrive and publisher Sourcebooks. The title’s position on Amazon’s Sales Rank charts also rose dramatically during the promotion’s first nine days, moving up more than 50,000 spots from 67,198 to 16,798.