Book 4, The Judas Strain - James Rollins
James Rollins’ All-Time Favorite Thrillers | Bookish https://www.bookish.com/articles/james-rollins-all-time-favorite-thrillers/
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James Rollins' latest book published this year -The Eyes of God Absolutely loved it! #books #mystery
The 10th Sigma Force novel offers Nazis, an ancient secret, a ticking nuclear clock and alien life-forms.
Subterranean - James Rollins
War Hawk - James Rollins and Grant Blackwood
James Rollins - I love the Sigma Force novels but also enjoy the individual novels. They are thought provoking.
Tracker by James Rollins A short novella (book 7.5) in the Sigma Force series http://mysterysequels.com/tracker-by-james-rollins.html