There are four mysteries on sale as part of an Open Road Media "Superbowl" sale. I just noticed this sale, and since the Superbowl is tomorrow, this sale may be fairly short-lived.
The mysteries are:
Collin Wilcox:
The Lonely Hunter - $1.99
Stuart M. Kaminsky:
The Big Silence - $0.99
Richard Curtis:
The Suicide Squad - $1.99
Charles Williams:
A Touch of Death - $0.99
The link to the Open Road page describing all of the books in the sale is:
http://www.openroadmedia.com/superbowl?
Once you are there you can click on each cover image to pull up a description of the book, and then click on the "buy the ebook" button for links to various retailers. Or, if you already know the retailer you want to use, you can just go search for the book there.
Open Road books are traditionally couponable at Kobo...