The Judas Strain
A judas strain is an organism that drives a species to extinction. From the Indian Ocean depths, an ancient menace plagues the modern world. Hope hides "within the language of angels." Aboard a cruise liner cum makeshift hospital, Dr Lisa Cummings and Monk Kokkalis, SIGMA agents, seek answers. But terrorists hijack the mercy ship for a floating bio-weapons lab.
4 July party a world away. SIGMA commander Gray Pierce thwarts an assassin who holds the first clue to a cure. He joins with her to follow the trail of Marco Polo. The quest winds through Venetian tombs, Byzantine cathedrals, and jungle-encrusted ruins. A relentless madman dogs every step. As seconds tick closer to doomsday, Pierce can trust no one. Any could be a Judas.
James Rollins
James Rollins is an internationally bestselling author renowned for his action-packed thrillers that blend historical mysteries, cutting-edge science, and gripping adventure. With a background in veterinary medicine and a deep passion for history and science, Rollins brings a unique perspective to his writing, often weaving these elements into his Sigma Force novels and other standalone books. His thrilling, page-turning narratives have earned him a loyal fanbase around the world, making him a leading figure in the realm of scientific thrillers and historical fiction.
Sigma Force
The Sigma Force series is a heart-pounding blend of military thrillers, historical mysteries, and action-packed adventures that have captivated readers worldwide. Created by bestselling author James Rollins, this series has earned critical acclaim for its fast-paced plots, complex characters, and its masterful combination of real-world history and thrilling fictional narratives. Perfect for fans of gripping espionage thrillers, action-packed sagas, and puzzle-filled mysteries, Sigma Force offers an unforgettable reading experience.
Sigma Force consists of eighteen primary books, and includes six additional books that complement the series but are not considered mandatory reads 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.

