Sentinel
An African coup may force Josh Duffy to choose between his mission and his family in this intense thriller from the #1 New York Times bestselling author of The Gray Man series.
Josh Duffy and his wife Nikki are both working for the State Department's Diplomatic Security Service providing protection for diplomats in the field. They've been sent to Ghana with a team of US embassy personnel who are there to highlight American commitment to the construction of a new dam.
Since Ghana is a stable democracy, the Duffy children have come along for a short vacation. But stability proves to be fleeting when a Chinese plan to embarrass the US means the destruction of the dam. Now Josh and his protectees are on the run caught between a Chinese hit squad and a rebel army.
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Mark Greaney
Long before The Gray Man was a global bestseller—or a Netflix action juggernaut—Mark Greaney was immersed in the world of shadows, diplomacy, and high-stakes espionage. What sets him apart isn’t just the precision of his plots or the grit of his protagonists—it’s his ability to make readers feel the tension of a sniper’s breath, the pulse of a tail through foreign streets, the weight of impossible decisions in murky moral terrain.
Greaney didn’t stumble into the thriller world; he stormed into it, notebook in hand and adrenaline in his blood. Raised in Memphis, Tennessee, he studied international relations and political science—fields that now pulse beneath the surface of his fiction. He took those early academic roots and grew them into stories that feel frighteningly plausible, weaving real-world geopolitics with explosive action. It's no wonder Tom Clancy's estate tapped him to co-write (and eventually continue solo) the Jack Ryan universe—a handoff that could’ve gone wrong in less capable hands but flourished under Greaney’s.
Joshua Duffy
Joshua Duffy consists of two books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.
