The Sigma Protocol

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American investment banker Ben Hartman returns to Zurich for a ski holiday, marking his first visit since his twin brother's tragic death there four years prior. However, his arrival triggers a sinister turn of events when he encounters old college friend Jimmy Cavanaugh, who unexpectedly pulls a gun and attempts to kill him. In the ensuing chaos, several innocent bystanders are killed, and Cavanaugh dies, leaving Ben barely alive and thrust into a nightmare. Meanwhile, Department of Justice agent Anna Navarro is being pursued by a relentless killer while investigating a series of mysterious deaths of elderly men worldwide. These deaths are linked by a decades-old CIA file marked with the code word "Sigma." As Anna narrowly escapes attacks, she realizes that the survivors are dwindling and her own life is at stake. When Ben and Anna's paths collide, they discover that their survival hinges on each other. Together, they race to uncover the dark secrets behind Sigma, which threaten their understanding of themselves, their relationships, and history itself. As they delve deeper, they confront a vast deception that could alter the fate of the world.