Amazon and B&N offered a free download of the second book in my series a few weeks ago. I was surprised it was the second and not the first book in the series, but after seeing the end result it made a crazy kind of sense. Here's how it played out:
I'd noticed a sudden uptick in sales of both book #1 and #2 in July and August--a slow steady climb--mostly because of a buzz that had been generated on a Goodreads discussion board (at least I think that was the cause). Book #3 came out (as both a hardcover and an ebook) on 8/31 and then the free download of book #2 came on 9/1 & 9/2.
The book was only free for two days and it catapulted to #1 in the Kindle store for part of those two days--no big surprise (although NovelRank shows the highest any of them got was 34--so go figure). But the interesting and more surprising result was that the other two books also catapulted in rank/sales and all three were in the Kindle top 100 for two weeks after that. Sales of the paperbacks and hardcovers went up as well, higher than they've ever been.
I have no idea how many free downloads there were, but I do know a lot of folks on Goodreads who were on the fence about checking out the series after people started talking about it made the leap when the freebie was offered. My actual sales (at least the numbers I have access to) for the first two books quadrupled for those two weeks (the third is a bit harder to figure since it just came out, but initial sales for it appear to be 25% stronger than initial sales of the other two.
Sales are slowing now, but still better than they were before the free offer. More important than sales ranking though is the fact that all those free downloads generated a bunch of new readers, reviews, and more buzz on Goodreads, Amazon, etc. In the month of September I've seen hundreds of readers added to my books' "groups" on Goodreads and other sites, and dozens of new reviews have popped up this month, too (by and large very favorable reviews--phew!) So while all those free downloads don't count as sales for me, there is no doubt in my mind that they generated sales, and perhaps more importantly, it grew my readership, my fan base, and my "buzz."
In hindsight, I think offering #2 as the free book was a brilliant strategy. Though the books are a series, all of them work well enough alone and offer a satisfying story. But interest in the middle child got a lot of people wanting to meet the eldest and the youngest. I'm not sure a free download of the first one would have done that, but who knows?
Beth