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Relentless: Gray Man, Book 10 audiobook cover

Mystery

Relentless: Gray Man, Book 10

By Mark Greaney

In "Relentless," the tenth book of the Gray Man series by Mark Greaney, Court Gentry, a former CIA operative turned mercenary, must uncover a sinister international conspiracy while combating formidable adversaries and grappling with a potentially lethal medical diagnosis.

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