The Sigma Protocol by Robert Ludlum is a fast-paced international thriller that combines conspiracy, espionage, and high-stakes action. The story follows Ben Hartman, an American investment banker vacationing in Switzerland, who suddenly finds himself targeted for assassination after a chance encounter with a childhood friend ends in a deadly shootout. As Ben tries to unravel the mystery behind the attack, he crosses paths with Anna Navarro, a tenacious Department of Justice investigator looking into a string of suspicious deaths tied to powerful global interests. Together, they uncover the existence of the Sigma Protocol—a secretive and dangerous operation tied to a cabal of elite figures manipulating world events for their own gain. What follows is a globe-trotting race against time to stop a sinister plot that threatens the future of humanity itself. Small spot on outside of pages. Please see photos for condition.