From Publishers Weekly

At the start of Ringo's darkly violent fifth Kildar novel (after 2006's Unto the Breach), Mike Jenkins, who's no longer a navy SEAL but still the Kildar, or feudal warlord, of the preternaturally competent Keldara warriors, withdraws into grief after the death of Gretchen Mahona, his lover and fellow soldier. When the U.S. president asks the Kildar to help track down shipments of nerve gas that jihadis are smuggling into Florida, he refuses, but gives permission for his subordinates to accept the mission. After they walk into an ambush, he's spurred to action, returning to center stage as a dangerous man whose humanity is in peril. It's up to the Keldara to guide their leader and friend back into the light and heal the wounds of his soul. Ringo counterbalances the angst with the joyous sangfroid of the pagan Keldara, who have once again become the warriors they were meant to be. (July)
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Product Description

Sequel to Ghost, Kildar, Choosers of the Slain and Unto the Breach.

Heart-sick over the deaths of so many of his Keldara followers, and one in particular, former SEAL Mike Harmon, hero of Ghost, Kildar and Choosers of the Slain, decides to sit this one out. WMDs headed for the US no longer matter to the Kildar. But when his best friend and intel specialist both are seriously wounded in an ambush aimed at him, the Kildar gets his gameface back on.

Mike has always said that he's not a nice guy, and he's about to prove it to a boatload of terrorists and Colombian drug dealers. Set in the Bahamas and Florida Keys, A Deeper Blue is a fast moving thriller that never slows down from the first page. With the return of some old faces, the action-packed novel proves, once again, the adage that sometimes it takes some very bad people to do good things.