What's the Name of That Book??? discussion

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The Sigma Protocol
SOLVED: Adult Fiction
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SOLVED. Fiction Thriller Action Spy Novel. Twin brothers, one was an agent & the other not (possibly a banker?). The agent brother dies, the other goes looking for him & discovers his twin was not dead but rather hiding from some killers. [s]
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lyiola, what is the story's time period and location(s) - country, region, big city/small town?
How did the spy/agent brother appear to die? How far into the book do you learn he didn't die but is hiding from killers? Who does he work for?
How did the spy/agent brother appear to die? How far into the book do you learn he didn't die but is hiding from killers? Who does he work for?

- The story's time period is probably set in the late 90s or early 2000s
- Locations: the USA and Europe (not sure where in Europe). I cannot remember the cities names - but I believe some of the cities were small
- The spy/agent brother died by headshot (sniper style) in a restaurant while meeting and conversing his other twin brother (they are identical twins). During this period, the villains wanted them both eliminated
- He died after the mid-way of the book
- I can't remember the organization he worked but the most likely government which betrayed him at the beginning of the story.
Thank you
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Kindly help