Amazon again offers its Prime members one early-release Kindle eBook per month for free as part of its Kindle First Program. (It costs $1.99 for non-members who sign up for Kindle First monthly emails.) That's $3 under the list prices of these books, which are otherwise only available as preorders.

Each month, you can choose from one of six new Kindle eBooks that are selected by Amazon's editors in advance of the books' official release dates. This month's titles include Todd Merer's The Extraditionist, Joy Jordan-Lake's A Tangled Mercy, Eliza Maxwell's The Unremembered Girl , and Richard Phillips' Mark of Fire.