Mystery

Based on sales at independent bookstores nationwide for the eight-week period ending February 21, 2016.

Based on sales at independent bookstores nationwide for the eight-week period ending December 27, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending October 18, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending August 2, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending May 17, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending March 1, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending January 4, 2015.

Based on sales at independent bookstores nationwide for the eight-week period ending March 2, 2014.

Based on sales at hundreds of independent bookstores nationwide for the eight-week period ending May 19, 2013.

Based on sales at hundreds of independent bookstores nationwide for the eight-week period ending March 3, 2013.

Based on sales at independent bookstores nationwide for the eight-week period ending January 6, 2013.

Based on sales at independent bookstores nationwide for the eight-week period ending October 21, 2012.

Based on sales at independent bookstores nationwide for the eight-week period ending August 5, 2012.

Based on sales at hundreds of independent bookstores nationwide for the eight-week period ending January 8, 2012.

Based on sales at hundreds of independent bookstores nationwide for the eight-week period ending May 17, 2011.