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The SIGMA Protocol - Ludlum, Robert, and To Be Announced (Read by), and Michael, Paul (Read by)
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Worldwide, old men whose only association is an OSS file marked Sigma, are being knocked off. Having narrowly avoided being one of them, investment banker Ben Hartman teams with U.S. government agent Anna Navarro to discover why. Unabridged.

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The SIGMA Protocol 2017, St. Martin's Press, New York

ISBN-13: 9781250141514

Mass-market paperback

The SIGMA Protocol 2017, St. Martin's Press

ISBN-13: 9780312337018

Paperback

The Sigma Protocol 2010, Orion (an Imprint of The Orion Publishing Group Ltd ), London

ISBN-13: 9781409117766

Mass-market paperback

The Sigma Protocol 2009, St. Martin's Press, New York

ISBN-13: 9780312943585

Paperback

The SIGMA Protocol 2008, MacMillan Audio

ISBN-13: 9781427204868

Audiobook CD

The Sigma Protocol 2002, St. Martin's Press, New York, NY

ISBN-13: 9780312982515

Mass-market paperback

The Sigma Protocol 2002, Orion (an Imprint of The Orion Publishing Group Ltd ), London

ISBN-13: 9780752848136

Paperback

The SIGMA Protocol 2002, St. Martin's Press

ISBN-13: 9780312984526

Mass-market paperback

The SIGMA Protocol 2002, Thorndike Press, Waterville, ME

ISBN-13: 9780786238880

Large type / large print

Hardcover

The Sigma Protocol 2002, Orion mass market paperback, London

ISBN-13: 9780752848815

New edition

Mass-market paperback

The SIGMA Protocol 2001, St. Martin's Press, New York, NY

ISBN-13: 9780312276881

Hardcover

The Sigma Protocol 2001, Orion, London

ISBN-13: 9780752841786

Hardcover

The SIGMA Protocol 2001, MacMillan Audio, Los Angeles, CA

ISBN-13: 9781559276887

Audiobook cassette

The SIGMA Protocol 2001, MacMillan Audio, Los Angeles, CA

ISBN-13: 9781559276863

Abridged

Audiobook cassette

The SIGMA Protocol 2001, MacMillan Audio, Los Angeles, CA

ISBN-13: 9781559276870

Abridged

Audiobook CD

The Sigma Protocol 2001, Orion, London

ISBN-13: 9780752841892

Paperback