Sierra Six — Gray Man Spy Thriller

6387144

Sierra Six — Gray Man Spy Thriller

Author(s): Mark Greaney
Publisher: National Geographic Books
Binding: Paperback
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Sierra Six

Years after his early days as Sierra Six, Court Gentry reappears in a tense Gray Man entry where a routine assignment forces him to face a figure tied to a past operation and a personal loss. The hunt becomes about finishing what was left undone.

Across an expansive, action-driven narrative, the novel blends close-quarters tradecraft, international reach, and moral stakes. At roughly 784 pages, it delivers long-form espionage plotted around a lone operative who refuses to leave debts unpaid.

Ideal for readers who enjoy layered protagonists, high-stakes intelligence work, and sustained pacing across a series.

  • Format: Paperback
  • Pages: 784
  • Publisher: National Geographic Books

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