In Zurich, Switzerland, American investment banker Ben
Hartman has arrived on holiday when he chances upon old
friend Jimmy Cavanaugh-- a madman who's armed and
programmed to assassinate. In a matter of minutes, six
innocent bystanders-- and Cavanaugh-- are dead. But when
his body vanishes, and his weapon mysteriously appears in
Hartman's luggage, Hartman is plunged into an unfathomable
nightmare, and suddenly finds himself on the run.
Meanwhile in Washington, D.C., Anna Navarro, field agent
for the Department of justice, has been asked to
investigate the sudden-- seemingly unrelated-- deaths of
eleven men throughout the world. The only thing that
connects them is a secret file, over a half-century old,
linked to the CIA, and marked with the same puzzling
codename: Sigma. But as Anna follows the connecting
thread, she finds herself in the shadows of a relentless
killer who is one step ahead of her, victim by victim.
Together she and Hartman must uncover the diabolical
secrets long held behind the codename, Sigma. It will
threaten everything they think they know about themselves
and confirm their very worst fears....