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Cover art for The Sigma Protocol

The Sigma Protocol

By Robert Ludlum

Genres: espionage, thriller-suspense

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Narrated by Paul Michael

Runtime: 6 h 4 min
Released: 2004
ASIN (us): B002V0QV32
6 chapters

Find on: Audible (US)

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Hero photograph: Long Room Interior, Trinity College Dublin, Ireland by Diliff, cropped and converted to greyscale, used under CC BY-SA 4.0. The modified image is offered under the same licence.