Amazon offers its Prime members one early-release Kindle eBook per month for free as part of its Amazon First Reads Program. (It costs $1.99 for non-members who sign up for Amazon First Reads monthly emails.) That's at least $5 under the list prices of these books, which are otherwise only available as preorders. Deal ends June 30.

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 Minka Kent's The Thinnest Air, Vin Vogel's A Home for Leo, and Joseph Reid's Take Off, .