EXCLUSIVE: See the Cover for Mark Greaney’s ‘Sentinel’ (with Details)


Last year, #1 New York Times bestselling author Mark Greaney kicked off a new series with Armored, a book inspired by the author’s Audible original drama of the same name. Now, Graeney will release his highly-anticipated follow-up when Sentiel hits bookstores on June 25, 2024, and Book Spy fans are getting an exclusive first look at the plot details and striking cover art.

Greaney, best known for the seven books he wrote in Tom Clancy’s Jack Ryan universe, some of which were co-written with Clancy himself, and his own bestselling Gray Man series, has been on a serious hot streak the past few years. Not only has the Memphis-based author dominated bestseller lists, but The Gray Man—the film adaption of his first novel, starring Ryan Gosling as Courtland Gentry and directed by Joe and Anthony Russowas the #1 most popular movie on Netflix in 2022. Known as one of the hardest-working and most versatile writers in the genre today, Greaney continues to churn out hit thrillers, and his readers are in for a real treat with 2024 setting up another double feature with both The Chaos Agent (his 13th Gray Man book, in stores February 20th) and Sentinel, scheduled for publication.

Sentinel will follow Armored, which introduced Joshua Duffy, a “Close Protection Agent,” which brings back Duffy and his wife Nikki, who are both now working for the State Department’s Diplomatic Security Service.

Check out the official plot details and cover art below.


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.



Mark Greaney has a degree in international relations and political science. In his research for the first Armored novel and the Gray Man novels, including Burner, Sierra Six, Relentless, One Minute Out, Mission Critical, Agent in Place, Gunmetal Gray, Back Blast, Dead Eye, Ballistic, On Target, and The Gray Man, he traveled to more than thirty-five countries and trained alongside military and law enforcement in theuse of firearms, battlefield medicine, and close-range combative tactics. With Marine Lt. Col Rip Rawlings, he wrote the New York Times bestseller Red Metal. He is also the author of the New York Times bestsellers Tom Clancy Supportand Defend, Tom Clancy Full Force and Effect, Tom Clancy Commander in Chief, and Tom Clancy True Faith and Allegiance. With Tom Clancy, he coauthored Locked On, Threat Vector, and Command Authority.

Readers excited to get their hands on Sentinel can now pre-order Mark Greaney’s forthcoming novel anywhere books are sold.



Praised as “One of the hardest working, most thoughtful, and fairest reviewers out there” by #1 New York Times bestselling author Lisa Scottoline, Ryan Steck has “quickly established himself as the authority on mysteries and thrillers” (Author A.J. Tata). Steck also works full-time as a freelance editor and is building a growing community on Twitch. His debut thriller, FIELDS OF FIRE, which #1 New York Times bestselling author Jack Carr says “will leave you speechless and begging for more,” is now available. His second novel, LETHAL RANGE, comes out on August 8th. For more information, be sure to follow him on Twitter and Facebook. And to take part in free, exclusive BOOK CLUBS each month, join The Real Book Spy on Discord.


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