"A high-octane, action-packed thriller filled with wicked fight scenes, bioweapons, assassins, supervillains, and Ledger's trademark grim humor. The novel is perfect for Maberry's fans or for those who enjoy thrillers with a horror and sci-fi edge." -- Library Journal , starred review "[A] relentless page-turner. Series fans will devour this." -- Publishers Weekly Additional Praise for Jonathan Maberry: "Once in a while, if you're really lucky, you find a book series that hits all the right spots. It excites the action fan in you, inspires you with its characters, and leaves you wanting more with its engrossing stories. Joe Ledger is that series for me. With its cross-genre blend of storytelling, amazing action, great characters and the best action dog ever, it's easy to see how much Jonathan Maberry loves writing Joe Ledger.

Almost as much as you'll love reading them." --Chad Stahelski, director of the JOHN WICK movies "Maberry takes a calculated risk here, both in crafting a story that is darker than your typical Ledger novel and in taking Joe to a place from which we wonder if he can fully return. it's exciting to see [the risks] paying off so spectacularly." -- Booklist on Relentless " Your heart will be in your throat during the non-stop action that Jonathan Maberry has created. one of the best in the business." -- Criminal Element on Rage "Maberry readers who haven't sampled the Ledger novels should rectify that immediately by cracking open this one." - Booklist on Cave 13.