Protocollo Sigma

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American investment banker Ben Hartman returns to Zurich for a ski holiday, his first since his twin brother's tragic death there four years ago. However, his arrival ignites a far more sinister chain of events. When he unexpectedly encounters old college friend Jimmy Cavanaugh, Cavanaugh pulls a gun and attempts to kill him, resulting in the deaths of several bystanders and Cavanaugh himself. Ben narrowly escapes, finding himself thrust into a terrifying nightmare and on the run. Meanwhile, Department of Justice agent Anna Navarro is being pursued globally by a relentless killer. Surviving these attacks through a mix of luck and skill, she is investigating the mysterious deaths of elderly men worldwide, all linked by a CIA file marked with the enigmatic code word: Sigma. As the danger escalates and the number of survivors dwindles, Ben and Anna's paths converge. They realize their only chance for survival lies in each other. Together, they race to uncover the dark secrets hidden behind Sigma, which threaten their understanding of themselves, their loved ones, and history itself. Ultimately, they discover a vast deception that could alter the fate of the world.