[gutvol-d] Beacon Lights of History on the top of the top 100 list

The Beacon Lights of History, Volume 11 by John Lord, rocketed to the top of the top 100 books yesterday, with 20,918 hits, which is totally out of range. (The #2 book got 400 hits, and the #2 book for the last 30 days got 10,000 hits.) Anyone know why this happened?