Here's how a Countdown works: I set a starting date and super low price on the book. In this case, I'm counting down on the Witches of Galdorheim series ebook (contains all three books in the series plus the prequel short story). Each day of the countdown, the price gets higher, so the earlier you buy, the better the deal. Here's the LINK TO THE EBOOK ON AMAZON.
Here's the schedule, price, and % savings. If you haven't read the books, you'd be freaking insane to pass up the lowest price. Each individual book is $2.99 regular price. Even at full price of $4.99, you're saving a bundle.
A similar deal with slightly different numbers will start the same day on Amazon UK. Click here for the countdown starting 24th of May on Amazon.co.UK